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  <xsd:element id="mg_AccruedLiabilitiesDeferredRevenuesAndContingentConsiderationLiabilitiesCurrent" name="AccruedLiabilitiesDeferredRevenuesAndContingentConsiderationLiabilitiesCurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="mg_AccruedLiabilitiesDeferredRevenuesAndContingentConsiderationLiabilitiesCurrentDisclosureTextBlock" name="AccruedLiabilitiesDeferredRevenuesAndContingentConsiderationLiabilitiesCurrentDisclosureTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_AccruedSalariesWagesAndEmployeeRelatedBenefitsCurrent" name="AccruedSalariesWagesAndEmployeeRelatedBenefitsCurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="mg_AccruedWorkersCompensationAndHealthBenefitsCurrent" name="AccruedWorkersCompensationAndHealthBenefitsCurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="mg_AcquisitionRelatedContingenciesMember" name="AcquisitionRelatedContingenciesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_AcquisitionRelatedCostsAndFairValueAdjustmentsToInitialPurchasePriceAllocation" name="AcquisitionRelatedCostsAndFairValueAdjustmentsToInitialPurchasePriceAllocation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_AcquisitionsinFiscal2016Member" name="AcquisitionsinFiscal2016Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_AcquisitionsinFiscal2017Member" name="AcquisitionsinFiscal2017Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_AcquisitionsinFiscal2018Member" name="AcquisitionsinFiscal2018Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_AcquisitionsinTransitionPeriodMember" name="AcquisitionsinTransitionPeriodMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_AdditionalDepreciationandAmortizationExpenseMember" name="AdditionalDepreciationandAmortizationExpenseMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_AerospaceandDefenseMember" name="AerospaceandDefenseMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_AllowanceforDoubtfulAccountsReceivablePercentagePastDue" name="AllowanceforDoubtfulAccountsReceivablePercentagePastDue" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="mg_AntidilutiveSecuritiesExcludedfromComputationofEPSDueToNetLossDuringPeriodAmount" name="AntidilutiveSecuritiesExcludedfromComputationofEPSDueToNetLossDuringPeriodAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_AverageDailyPriceofCommonStockForPrecedingMonthDiscountPercent" name="AverageDailyPriceofCommonStockForPrecedingMonthDiscountPercent" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_BoardofDirectorsChairmanandChiefExecutiveOfficerMember" name="BoardofDirectorsChairmanandChiefExecutiveOfficerMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_BoilermakersandPipefittersPlansMember" name="BoilermakersandPipefittersPlansMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_BusinessCombinationAcquisitionRelatedCostsIncludedinProFormaInformationEarningsorLossofAcquireesinceAcquisitionDateActual" name="BusinessCombinationAcquisitionRelatedCostsIncludedinProFormaInformationEarningsorLossofAcquireesinceAcquisitionDateActual" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="mg_BusinessCombinationContingentConsiderationArrangementsAcquisitions" name="BusinessCombinationContingentConsiderationArrangementsAcquisitions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="mg_BusinessCombinationContingentConsiderationArrangementsContingentConsiderationAccretionofLiability" name="BusinessCombinationContingentConsiderationArrangementsContingentConsiderationAccretionofLiability" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="mg_BusinessCombinationContingentConsiderationArrangementsContingentConsiderationForeignCurrencyTranslationAdjustments" name="BusinessCombinationContingentConsiderationArrangementsContingentConsiderationForeignCurrencyTranslationAdjustments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="mg_BusinessCombinationContingentConsiderationArrangementsPayments" name="BusinessCombinationContingentConsiderationArrangementsPayments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="mg_BusinessCombinationContingentConsiderationArrangementsWorkingCapitalAdjustments" name="BusinessCombinationContingentConsiderationArrangementsWorkingCapitalAdjustments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="mg_BusinessCombinationContingentConsiderationInitialPaymentPeriod" name="BusinessCombinationContingentConsiderationInitialPaymentPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_BusinessCombinationContingentConsiderationPaymentPeriod" name="BusinessCombinationContingentConsiderationPaymentPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDebtAndOtherLongTermLiabilities" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDebtAndOtherLongTermLiabilities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="mg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssets" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="mg_CanadaandUnitedStatesMember" name="CanadaandUnitedStatesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_CapitalLeaseObligationsEffectiveInterestRate" name="CapitalLeaseObligationsEffectiveInterestRate" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_CapitalLeaseObligationsRequiredMonthlyPayments" name="CapitalLeaseObligationsRequiredMonthlyPayments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_CapitalManagementEnterpriseCMEMember" name="CapitalManagementEnterpriseCMEMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_ConsultingServicesMember" name="ConsultingServicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_ContingentConsiderationLiabilityRollForward" name="ContingentConsiderationLiabilityRollForward" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_CorporateAndEliminationsMember" name="CorporateAndEliminationsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_CurrentIncomeTaxExpenseBenefitReserveforUncertainTaxPositions" name="CurrentIncomeTaxExpenseBenefitReserveforUncertainTaxPositions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_CustomerAMember" name="CustomerAMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_CustomerRelationshipsandNoncompeteAgreementsMember" name="CustomerRelationshipsandNoncompeteAgreementsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_DebtInstrumentAdditionalInterestRateDueToFundedDebtLeverageRatioExceedingSpecifiedThreshold" name="DebtInstrumentAdditionalInterestRateDueToFundedDebtLeverageRatioExceedingSpecifiedThreshold" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_DebtInstrumentCovenantFundedDebtLeverageRatioForAdditionalInterestPayment" name="DebtInstrumentCovenantFundedDebtLeverageRatioForAdditionalInterestPayment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_DebtInstrumentCovenantFundedLeverageRatioConsideredForLowerInterestRateMargin" name="DebtInstrumentCovenantFundedLeverageRatioConsideredForLowerInterestRateMargin" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_DebtInstrumentCovenantFundedLeverageRatioConsideredForMaximumInterestRateMargin" name="DebtInstrumentCovenantFundedLeverageRatioConsideredForMaximumInterestRateMargin" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_DebtInstrumentCovenantInterestCoverageRatio" name="DebtInstrumentCovenantInterestCoverageRatio" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_DebtInstrumentCovenantTemporarilyIncreaseinFundedDebtLeverageRatioduetoBusinessAcquisitions" name="DebtInstrumentCovenantTemporarilyIncreaseinFundedDebtLeverageRatioduetoBusinessAcquisitions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_DebtInstrumentNonrecurringChargesThresholdUsedForCalculationofFundedDebtLeverageRatio" name="DebtInstrumentNonrecurringChargesThresholdUsedForCalculationofFundedDebtLeverageRatio" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="mg_DebtInstrumentNumberOfFiscalQuartersUsedForCalculationOfFundedDebtLeverageRatio" name="DebtInstrumentNumberOfFiscalQuartersUsedForCalculationOfFundedDebtLeverageRatio" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_DebtInstrumentNumberofFiscalQuartersToTemporarilyIncreaseFundedDebtLeverageRatioduetoBusinessAcquisitions" name="DebtInstrumentNumberofFiscalQuartersToTemporarilyIncreaseFundedDebtLeverageRatioduetoBusinessAcquisitions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_DebtInstrumentPrecedingPeriodUsedForCalculationOfInterestCoverageRatio" name="DebtInstrumentPrecedingPeriodUsedForCalculationOfInterestCoverageRatio" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_DeferredIncomeTaxExpenseBenefitNet" name="DeferredIncomeTaxExpenseBenefitNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="mg_DeferredIncomeTaxNoncashExpenseBenefit" name="DeferredIncomeTaxNoncashExpenseBenefit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="mg_DeferredTaxAssetsCapitalLeaseObligation" name="DeferredTaxAssetsCapitalLeaseObligation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="mg_DefinedContributionPlanContinuousServicePeriodAfterWhichEmployeesBecomeEligibleToParticipateUnderPlan" name="DefinedContributionPlanContinuousServicePeriodAfterWhichEmployeesBecomeEligibleToParticipateUnderPlan" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPeriod" name="DefinedContributionPlanEmployersMatchingContributionAnnualVestingPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_DefinedContributionPlanMinimumAgeForEmployeesToContributeCatchUpContributionsUnderIRSLimits" name="DefinedContributionPlanMinimumAgeForEmployeesToContributeCatchUpContributionsUnderIRSLimits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_DisposalGroupIncludingDiscontinuedOperationAssetsPercentageOfConsolidatedAssets" name="DisposalGroupIncludingDiscontinuedOperationAssetsPercentageOfConsolidatedAssets" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="mg_DisposalGroupIncludingDiscontinuedOperationConsiderationPostClosingAdjustment" name="DisposalGroupIncludingDiscontinuedOperationConsiderationPostClosingAdjustment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="mg_DisposalGroupIncludingDiscontinuedOperationLiabilitiesPercentageOfConsolidatedLiabilities" name="DisposalGroupIncludingDiscontinuedOperationLiabilitiesPercentageOfConsolidatedLiabilities" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="mg_DisposalGroupIncludingDiscontinuedOperationLiabilitiesPercentageOfConsolidatedRevenues" name="DisposalGroupIncludingDiscontinuedOperationLiabilitiesPercentageOfConsolidatedRevenues" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_DisposalGroupNumberofSubsidiariesClassifiedasHeldforsale" name="DisposalGroupNumberofSubsidiariesClassifiedasHeldforsale" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_DisposalOfForeignSubsidiariesMember" name="DisposalOfForeignSubsidiariesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_DisputewithformerownerofcompanysFrenchsubsidiaryMember" name="DisputewithformerownerofcompanysFrenchsubsidiaryMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_DocumentAndEntityInformationAbstract" name="DocumentAndEntityInformationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_EffectiveIncomeTaxRateReconciliationTransitionTaxNetofForeignCreditsAmount" name="EffectiveIncomeTaxRateReconciliationTransitionTaxNetofForeignCreditsAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="mg_EffectiveIncomeTaxRateReconciliationTransitionTaxNetofForeignCreditsPercent" name="EffectiveIncomeTaxRateReconciliationTransitionTaxNetofForeignCreditsPercent" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_EmployeeStockOwnershipPlanNumberOfPlans" name="EmployeeStockOwnershipPlanNumberOfPlans" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_EntityShellCompany" name="EntityShellCompany" nillable="true" substitutionGroup="xbrli:item" type="xbrli:booleanItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_ExecutiveAndSeniorOfficersMember" name="ExecutiveAndSeniorOfficersMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_ExpirationPeriod20212036Member" name="ExpirationPeriod20212036Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_FiniteLivedIntangibleAssetsImpairedAccumulatedImpairmentLoss" name="FiniteLivedIntangibleAssetsImpairedAccumulatedImpairmentLoss" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="mg_Fiscal2014GrantsMember" name="Fiscal2014GrantsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_Fiscal2015GrantsMember" name="Fiscal2015GrantsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_Fiscal2016GrantsMember" name="Fiscal2016GrantsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_Fiscal2017GrantsMember" name="Fiscal2017GrantsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_Fiscal2018GrantsMember" name="Fiscal2018GrantsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_FiscalTransitionPeriod2016GrantsMember" name="FiscalTransitionPeriod2016GrantsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_IncreaseDecreaseInOtherAccruedLiabilitiesAndDeferredLiabilities" name="IncreaseDecreaseInOtherAccruedLiabilitiesAndDeferredLiabilities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="mg_IncrementalCommonSharesAttributableToRestrictedStockUnitsOutstanding" name="IncrementalCommonSharesAttributableToRestrictedStockUnitsOutstanding" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_IncrementalCommonSharesAttributableToStockOptionsOutstanding" name="IncrementalCommonSharesAttributableToStockOptionsOutstanding" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_IndustrialsMember" name="IndustrialsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_InfrastructureResearchandEngineeringMember" name="InfrastructureResearchandEngineeringMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_InternationalMember" name="InternationalMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_LineOfCreditFacilityAccordionFeatureHigherBorrowingCapacityOption" name="LineOfCreditFacilityAccordionFeatureHigherBorrowingCapacityOption" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="mg_LineOfCreditFacilityMaximumBorrowingCapacityAvailableForIssuanceOfLettersOfCredit" name="LineOfCreditFacilityMaximumBorrowingCapacityAvailableForIssuanceOfLettersOfCredit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="mg_LineOfCreditFacilityMaximumBorrowingCapacityInNonUSCurrencies" name="LineOfCreditFacilityMaximumBorrowingCapacityInNonUSCurrencies" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="mg_LongTermIncentivePlan2016Member" name="LongTermIncentivePlan2016Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_LongtermDebtExcludingLettersofCredit" name="LongtermDebtExcludingLettersofCredit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="mg_McAllisterv.MistrasGroupIncMember" name="McAllisterv.MistrasGroupIncMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_MinimumAmountOfWorkersCompensationAndHealthBenefitClaimsForWhichThirdPartyExcessInsuranceCoverageMaintained" name="MinimumAmountOfWorkersCompensationAndHealthBenefitClaimsForWhichThirdPartyExcessInsuranceCoverageMaintained" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="mg_MultiemployerPlanContributionsbyEmployerPercentageofTotalContributions" name="MultiemployerPlanContributionsbyEmployerPercentageofTotalContributions" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="mg_NDTDoBrazilLTDAMember" name="NDTDoBrazilLTDAMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_NumberOfMonthsLessThanActualPeriodFromAcquisitionForWhichResultsOfInternationalSegmentSubsidiariesAreIncludedInConsolidation" name="NumberOfMonthsLessThanActualPeriodFromAcquisitionForWhichResultsOfInternationalSegmentSubsidiariesAreIncludedInConsolidation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_NumberofDirectors" name="NumberofDirectors" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="mg_NumberofEmployeesUnderCurrentStaffLeasingContracts" name="NumberofEmployeesUnderCurrentStaffLeasingContracts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="mg_OfficeFurnitureAndEquipmentMember" name="OfficeFurnitureAndEquipmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_OilGasMember" name="OilGasMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_OnstreamMember" name="OnstreamMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_OtherAmericasMember" name="OtherAmericasMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_OtherLongTermDebtMember" name="OtherLongTermDebtMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_OtherProcessIndustriesMember" name="OtherProcessIndustriesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_OtherProductsandServicesMember" name="OtherProductsandServicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_PaymentsOfContingentConsiderationForBusinessAcquisitions" name="PaymentsOfContingentConsiderationForBusinessAcquisitions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="mg_PaymentsToAcquireIntangibleAssetsAndSoftware" name="PaymentsToAcquireIntangibleAssetsAndSoftware" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_PerformanceSharesWithOneYearEPSPerformanceConditionMember" name="PerformanceSharesWithOneYearEPSPerformanceConditionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_PerformanceSharesWithThreeYearEPSPerformanceConditionMember" name="PerformanceSharesWithThreeYearEPSPerformanceConditionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_PerformanceSharesWithTwoYearEPSPerformanceConditionMember" name="PerformanceSharesWithTwoYearEPSPerformanceConditionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_PerformanceShareswithOneYearMarketConditionMember" name="PerformanceShareswithOneYearMarketConditionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_PerformanceShareswithThreeYearEPSPerformanceandMarketConditionsMember" name="PerformanceShareswithThreeYearEPSPerformanceandMarketConditionsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_PerformanceShareswithTwoYearMarketConditionMember" name="PerformanceShareswithTwoYearMarketConditionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_PeriodLagOfInternationalSegmentSubsidiariesConsolidated" name="PeriodLagOfInternationalSegmentSubsidiariesConsolidated" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_PowerGenerationandTransmissionMember" name="PowerGenerationandTransmissionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_ProductsandSystemsMember" name="ProductsandSystemsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_RangeOfExercisePricesFromDollars13.46To22.35Member" name="RangeOfExercisePricesFromDollars13.46To22.35Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_RangeofExercisePricesfromDollars6.15to11.54Member" name="RangeofExercisePricesfromDollars6.15to11.54Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_RelatedPartyTransactionRentPayments" name="RelatedPartyTransactionRentPayments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_RestrictedStockUnitsRSUsandPerformanceStockUnitsPSUsMember" name="RestrictedStockUnitsRSUsandPerformanceStockUnitsPSUsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_RevenueRemainingPerformanceObligationExpectedTimingofSatisfactionPeriod1" name="RevenueRemainingPerformanceObligationExpectedTimingofSatisfactionPeriod1" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_ScheduleOfAccruedLiabilitiesDeferredRevenueAndContingentConsiderationLiabilitiesCurrentTableTextBlock" name="ScheduleOfAccruedLiabilitiesDeferredRevenueAndContingentConsiderationLiabilitiesCurrentTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_ScheduleOfBusinessCombinationAcquisitionRelatedCostsTableTextBlock" name="ScheduleOfBusinessCombinationAcquisitionRelatedCostsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_SelfInsurancePolicyTextBlock" name="SelfInsurancePolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_ServicesMember" name="ServicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_SeveranceandLaborDisputesMember" name="SeveranceandLaborDisputesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardPerformancePeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardPerformancePeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfNonEmployeeDirectorsToWhomAwardIsGranted" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfNonEmployeeDirectorsToWhomAwardIsGranted" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsAbstract" name="ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsAbstract" name="ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_SharebasedCompensationArrangementBySharebasedPaymentAwardPayoutPercentageofTarget" name="SharebasedCompensationArrangementBySharebasedPaymentAwardPayoutPercentageofTarget" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardPayoutPerformancePeriod" name="SharebasedCompensationArrangementbySharebasedPaymentAwardAwardPayoutPerformancePeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsAdjustmentinPeriodWeightedAverageGrantDateFairValue" name="SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsAdjustmentinPeriodWeightedAverageGrantDateFairValue" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_SharebasedCompensationAwardTrancheFourMember" name="SharebasedCompensationAwardTrancheFourMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_ShareholderAndOfficerMember" name="ShareholderAndOfficerMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_StateandForeignTaxAuthoritiesMember" name="StateandForeignTaxAuthoritiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_StockOptionPlan2007andLongTermIncentivePlan2009Member" name="StockOptionPlan2007andLongTermIncentivePlan2009Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_StockRepurchasePlanMember" name="StockRepurchasePlanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_StockRepurchaseProgramAuthorizedAmountPerMonth" name="StockRepurchaseProgramAuthorizedAmountPerMonth" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="mg_TaxCutsandJobsActChangeinTaxRateDeferredTaxAssetIncomeTaxExpense" name="TaxCutsandJobsActChangeinTaxRateDeferredTaxAssetIncomeTaxExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="mg_TaxCutsandJobsActChangeinTaxRateDeferredTaxLiabilityIncomeTaxBenefit" name="TaxCutsandJobsActChangeinTaxRateDeferredTaxLiabilityIncomeTaxBenefit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="mg_TaxCutsandJobsActGILTITaxExpense" name="TaxCutsandJobsActGILTITaxExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="mg_TaxCutsandJobsActIncomeTaxExpenseBenefit" name="TaxCutsandJobsActIncomeTaxExpenseBenefit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="mg_TaxCutsandJobsActIncompleteAccountingChangeinTaxRateDeferredTaxAssetProvisionalIncomeTaxExpense" name="TaxCutsandJobsActIncompleteAccountingChangeinTaxRateDeferredTaxAssetProvisionalIncomeTaxExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="mg_TaxCutsandJobsActIncompleteAccountingChangeinTaxRateProvisionalIncomeTaxExpenseBenefit" name="TaxCutsandJobsActIncompleteAccountingChangeinTaxRateProvisionalIncomeTaxExpenseBenefit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="mg_TaxCutsandJobsActIncompleteAccountingTransitionTaxforAccumulatedForeignEarningsProvisionalIncomeTaxExpense" name="TaxCutsandJobsActIncompleteAccountingTransitionTaxforAccumulatedForeignEarningsProvisionalIncomeTaxExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="mg_TaxCutsandJobsActMeasurementPeriodAdjustmentIncomeTaxExpenseBenefit" name="TaxCutsandJobsActMeasurementPeriodAdjustmentIncomeTaxExpenseBenefit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="mg_TaxCutsandJobsActOtherNondeductibleTaxExpense" name="TaxCutsandJobsActOtherNondeductibleTaxExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="mg_TaxCutsandJobsActTransitionTaxforAccumulatedForeignEarningsLiability" name="TaxCutsandJobsActTransitionTaxforAccumulatedForeignEarningsLiability" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="mg_TaxCutsandJobsActTransitionTaxonAccumulatedForeignEarningsTaxExpense" name="TaxCutsandJobsActTransitionTaxonAccumulatedForeignEarningsTaxExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="mg_TemporaryStaffLeasingContractPeriod" name="TemporaryStaffLeasingContractPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_TermALoanFacilityMember" name="TermALoanFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="mg_TriumphAerostructuresVoughtAircraftDivisionvMistrasGroupMember" name="TriumphAerostructuresVoughtAircraftDivisionvMistrasGroupMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="mg_WithdrawalfromMultiemployerDefinedBenefitPlanExpense" name="WithdrawalfromMultiemployerDefinedBenefitPlanExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
</xsd:schema>
