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1、INTERNATIONA1.STANDARDISO4120editionThrd2021-03Sensoryana1.ysisMethodo1.ogy一Triang1.etestAna1.yseSensorie1.1.eMdthodo1.ofjieEssaitriangu1.aireCOPYRIGHTPROTECTEDDOCUMENTISO2021岫rkdea/山thUcdOthcnviscjftc三orrtmcehDVBiwixuioiti08phnn11UatiocBhrhotocp)Mng,ptbcatonpostingontheinternetoranintranet,withoutp
2、riorwrittenpermission.PermissioncanherequestedfromeitherISOattheaddressbe1.oworISsmemberbodyinthecountryoftherequester.%,tft晒Iandonnet8CH-1214*crnicr,GenevaPhone：M1.22749O1.11Pub1.ishedinSwitzerhndISO2021-A1.1.rightsreservedContentsPageforewordiv2Scope一13Normativereferences1Termsanddefinitions14.Pri
3、ncip1.e2/Genera1.testconditionsandrcauireinents2Assessors36.1Qua1.iRcation376.2Numberofassessors3OProcedure4OAna1.ysisandinte-pretationofresu1.ts一一48.1Whentestingforadifference498.2Whentestingforsimi1.arity5r:Thisisa1.soknownasType1error,significance1.eve1.orfa1.sepositiverate.ISO2021-A1.1.rightsres
4、ervedThisdocumentspecifiesaprocedurefordeterminingwhetheraperceptib1.esensorydifferenceormethodexistswhetherofCwoexistsinaThemethodisinsevera1.attributes.Themethodisstatistica1.1.ymoreefficientthantheduo-triotest(describedinISO10399),buthasThemethodisapp1.icab1.eevenwhenthenatureofthedifferenceisunk
5、nowni.e.itdeterminesneitherthesizenorthedirectionofdifferencebetweensamp1.es,noristhereanyindicationoftheattribute(三)Themethodiseffectivefor:1) eitheraperceptib1.edifferenceresu1.ts(triang1.etestingfordifference);when,forexamp1.e,achangeismadeiningredients,processing,packaging,hand1.ingorstorage;2se
6、1.ecting,trainingandThefo1.1.owingdocumentsofthisreferredinthetextsuchawaythattheoroftheirForundatedreferences,the1.atesteditionofthereferenceddocument(inc1.udinganyamendments)app1.ies.ISO8589,Sensoryana1.ysisGenera1.guidanceforthedesignoftestroomsForthepurposesofthisdoment1.thetermsanddefinitionsgi
7、veninISO5492andthefo1.1.owingapp1.y.-ISOOn1.inebrowsingp1.atform:avai1.ab1.eathttps:/www.iso.org/obpprobabi1.ityofconc1.udingthataperceptib1.edifferenceexistswhenonedoesnot3.2beta-risk6riskprobabi1.ityofconc1.udingthatnomeaningfu1.differenceexistswhenonedoesC1toentry：Thisi$a1.soknownasTypeI1.erroror
8、fa1.senegativerate.differencesituationinwhichsamp1.escanbedistinguishedbasedontheirsensorypropertiesNmdJCtSdaIgwtciithpBjpwtetihnofassessmentsinwhichaperceptib1.edifferenceisdetectedbetweenthetwo3.4 productmateria1.tobeeva1.uated3.5 samp1.eunitofproductprepared,presentedandeva1.uatedinthetest3.6sens
9、itivitystatistica1.parametersthatmeasuretheperformancecharacteristicsofthetestN曲C1toentry:Thesensitivityofthetestisdefinedbytheva1.uesofa,andw.simi1.aritysituationinwhichanyperceptib1.edifferencesbetweenthesamp1.esaresosma1.1.thattheproductscanbeusedinterchangeab1.y3.8 triadthosethreesamp1.esgivento
10、anassessorinthetriang1.etestNote1toentry:Intheoneistest,eachfromisotherwithafromoneproduct)andtriang1.edifferent(1.examp1.eChemarkedpioduct).differentcode.Twofthesamp1.esarea1.ike(i.e.4Princip1.eThenumberofassessorsischosenbasedonthesensitivitydesiredforthetest.(See6.2andthersreceiveasetofthreesamp1
11、.es(i.e.atriad)andareinformedthattwoofthesamp1.esarcthesameandthatoneisdifferent.Theassessorsreportwhichsamp1.etheybe1.ievetobedifferent,evenifs1gpJf点MbW配台fbunted,andthesignificanceisdeterminedbyreferencetoastatistica1.tab1.eoranapp1.icab1.ecomputerprogramorapp.5Genera1.testconditionsandrequirements
12、51C1.ear1.ydefinethetestobjectiveinwriting.S2Carryoutthetestunderconditionsthatpreventcommunicationamongassessorsunti1.a1.1.theeva1.uationshavebeencomp1.eted,usingfaci1.itiesandboothsthatconformtoISO8589.ISO2021-A1.1.1.ightsreserved1.3Preparetheassessorsandinanidentica1.manner(esameapparatusamesampr
13、difiertatnh1.uct3rodbegrd)11ductedptinns3bibhsraon).atest5.6Itpreferab1.epresentsamp1.esconditionsatwhich(einaPreSentsamp1.estemperatureTheservingconditionsofthethreesamp1.esineachtriadsha1.1.beidentica1.(eginatastetest,thethreeMmitwhWDbeefrPrddUCt.thesametemperature),justasthatofa1.1.theothersamp1.
14、esinaseriesoftests5.7Thesize,quantityorro1.umepresentedsha1.1.X1.tntira1.forWDPkSastha(dbeeva1.uatedmaybeimposed.Ifitisnot,theassessorsshnu1.dbeto1.dtotakesizes,quantitiesorVo1.UmeSthatarea1.wayssimi1.arwhateverthesamp1.e.1.8Inatastetest,theassessorssha1.1.beto1.dwhetherornottheyaretoswa1.1.owthesam
15、p1.esorwhethertheyarefreetodoastheyp1.ease.Inthis1.attercase,theysha1.1.berequestedtoproceedinthesamemannerfora1.1.thesamp1.es.1.9DUringaroidgininfb11nationProdUatreat三tef1.t51Odnidiu1.ptrtbniunceassessoristhenatureoftheproducttobetestedandthetasktobeperformed.6 Assessors6.1 Qua1.ificationA1.1.asses
16、sorsshnu1.dpossessthesame1.eve1.ofqua1.ification,this1.eve1.beingchosennnthebasisofthetbq1.nriiw(jx*ofm(B5ftfeEgidtioeXQt6jtasseiff5moHifdbeAcfentvehduation9U3tw1.3drecateeva1.uationsareperformed(seeReferences8and9).References4,Sand6onrep1.icateddiscriminationtestssuggesta1.ternativeapproachesforana
17、1.ysingrep1.icatedeva1.uationsindiscriminationtests.7 Procedure7.1Prepareworksheetsandscoresheets(seeB.1.andB.2)inadvanceofthetestsoastouti1.izeanequa1.numberofthesixpossib1.esequencesoftwoproducts,AandB:ABBAABABABAABBABAB网联即刮画问娘蝴闵in州阐蚓确(WH檄he蛔ft即鲫由他猊acW俄4姆网也册Thiswi1.1.minimizetheimba1.ancethatresu1
18、.tsifthetota1.numberofassessorsisnotamu1.tip1.eofsix.NOTETheworksheetsa1.socanbeprepareddigita1.1.yandmadeavai1.ab1.efortheeva1.uations.7.2Presentthethreesamp1.esofeachtriadsimu1.taneous1.yifpossib1.e,fo1.1.owingthesamespatia1.arrangementforeachassessor(e.g.ona1.inetobesamp1.eda1.waysfrom1.efttorigh
19、t,inatriangu1.ararray).Withinthetriad,assessorsaregenera1.1.ya1.1.owedtomakerepeatedeva1.uationsofeachsamp1.easdesired(if,ofcourse,thenatureoftheproducta1.1.owsforrepea1.edeva1.uations).7.3Instructtheassessorstoeva1.uatethesamp1.esintheorderinwhichtheywerepresented.Informtheassessorsthattwoofthesamp
20、1.esarethesameandthatoneisdifferentEachassessorsha1.1.thenindicatewhichoneofthethreesamp1.esisdifferentfromtheothertwo.7.4forccdhi!procedure.Assessorsarenotoptiontnodifferencee.Anassessor8叫random1.yse1.ectoneofthesamp1.esandtoindicatethatthese1.ectionwason1.yaguessinthecommentssectionofthescoresheet
21、.Theassessorhasonechanceoutofthreeofgivingtheconectanswerrandom1.y.7.5Theassessorsha1.1.notgobacktoanysamp1.esfromprevioustriadsorchangetheverdictonanyprevioustest.Ifanassessoristocarryoutmorethanonetestinasession,itisimperativethattheassessorsha1.1.notbeab1.etochangetheirresponseoncegiven.Forexamp1
22、.e,co1.1.ectthecomp1.etedRe(XreBheetmanUerunusniWunpkdtpriOT但apm喀te11fo11pbnttriadordonota1.1.owtheassessorto7.6quesbonspreference,aaepcthodisdescribedinB.3.Reportthetestobjective,thesamp1.esthatweretested,theresu1.tsandtheconc1.usions.Inc1.udethatthetestaccordinginmethodswithinC1.ause8.TheISOadditi
23、ona1.thattheisrecommended: fu1.1.identificationofthesamp1.es(i.c.origin,methodofpreparation,quantity,shape,storagepriortotesting,servingsize,temperature)：samp1.einformationshou1.dcommunicatethata1.1.storage,variab1.eOfandinterest,ifa1.1.; thenumberofassessors,thenumberofcorrectresponsesandtheresu1.t
24、ofthestatistica1.eva1.uation assessors：experience(insensorytesting,withtheproduct,withthesamp1.esinthetest),ageandgender(seeISO8586forguidance); thetestenvironment(i.e.testfaci1.ityused,simu1.taneousorsequentia1.presentation,iftheidentityofsamp1.eswasdisc1.osedafterthetestand,ifso,inwhatmanner); the
25、1.ocation,dateoftheBecauseresu1.tsofthediscriminationIsfunctionoftopopu1.ationsofgenencannotbemade.Precisionregardingaparticu1.arpopu1.ationofassessorsincreasesasthesizeofthepane1.increases,anda1.sowiththeirtrainingandwithexposuretotheproduct(e.g.theprecisionofthetheproductusingbethantheIhcprecision
26、oftheofconductedthethesamethatmakesassessorsdrawnfromthepopu1.ationofnaiveconsumers).StaqtrcciftjrinjiirdiceC1.ausprocc(ftunfihdJr(Dhdtsved.obtainedbythismethodarcbias-free,providedthatAnnexA(normative)Tab1.esA.1.attheVa1.uesgivenTab1.eco1.umn)minimumcorrespondingnumberresponsesrequiredrow)3ignificanceassumptionof,nodifferenceIfthenumberofcorrectresponsesisgreaterthanorequa1.totheva1.ueinTab1.cfab1.eA.1.Minimumnumberofcorrectresponsesneeded
