Designation:E2335−17AnAmericanNationalStandardStandardGuideforLaboratoryMonitors1ThisstandardisissuedunderthefixeddesignationE2335;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONThisguideisforusebylaboratorymonitorswhoobserveinterlaboratorytestingperformedbyparticipatingorganizationsthatvalidatethelegitimacyoftestmethodsandalsoestablishabaseofdatafromwhichprecisionandbiasstatementsaretobewritten.Interlaboratorytestingisdonetodeterminethevalidityofateststandard.Suchtestingrequiresdiligencebyadheringtotheprotocolestablishedforperformingthetestinordertominimizevariabilitywhichoftenexistsbetweenlaboratories.Becauselaboratoriesdifferinsize,organization,management,personnel,facilitiesandenvironmentthereisalwaysapotentialforintroducingvariabilityintestresults.Laboratorymonitorsconfirmthattheparticipatingfacilitiesadheretothetestprotocolascloselyaspossible,therebyimprovingthechancesofasuccessfulinterlaboratorystudy.Thelaboratorymonitorobservesandassessesbutdoesnotperformthefunctionsofanauditorortrainer;thelaboratorymonitordoesnotprovideaccreditationofalaboratory.Laboratorymonitorsshoulddemonstrateexpertiseinboththecontentandtheintentofthetestmethod.Thelaboratorymonitorisresponsibletorenderareporttotheappointingsubcommittee.Itisincumbentuponthelaboratorymonitortomaintainobjectivitywhenworkingwithparticipatinglaboratories.Full-scaleproductfiretestsareexpensive,especiallyfull-scaletestsofbeddingandhomefurnishings.ThedevelopmentofthisstandardisintendedtoensurethattheprecisionandbiasdevelopedforE05standardsdemonstratesahighlevelofstatisticalvalidity.Thisguidedoesnotcontainproceduresforanalysisofthetestdataobtainedfromaninterlaboratorystudy.TheuserisdirectedtoPracticeE691,ifthelaboratorystudyincludessixlaboratoriesormore,andtoPracticeE2653ifthenumberoflabora...
