美国大学课程考试试题及答案

TheNatureandOrigin

ofInstructionalObjects1

AndrewS.Gibbons

JonNelson

UtahStateUniversity

RobertRichards

IdahoNationalEngineeringandEnvironmentalLaboratory

Introduction

Thischapterexaminesthenatureandoriginofaconstructwetermtheinstructional

object.Ratherthanbeingasingledefinableobject,itisacomplexandmulti-faceted

emergingtechnologicalconstruct-onepieceofalargertechnologicalpuzzle.The

generaloutlinesofthepuzzlepiecearetakingshapeconcurrentlyintheseveral

disciplinesfromwhichthepracticesofinstructionaltechnologyarederived-computer

science,informationtechnology,intelligenttutoringsystems,andinstructional

psychology.Theterminologyusedtodescribethisnewideareflectsitsmultipleorigins,

1Thischapterdescribesresearchontheinstructionaldesignprocesscarriedoutundertheauspicesofthe

Human-SystemSimulationsCenterattheIdahoNationalEnvironmentalandEngineeringLaboratory

(DepartmentofEnergy).

itsdiversemotivations,anditsnewness.Intheliteraturewhatwewillrefertoasthe

"instructionalobject“istermedvariously"instructionalobject/5'"educationalobjectJ

"learningobject,"knowledgeobject,"""intelligentobject,and“dataobject.^^Ourwork

ismostheavilyinfluencedbytheworkofSpohrerandhisassociatesoneducational

objecteconomies(Spohrer,Sumner&Shum,1998).

Muchhasbeenwrittenaboutinstructionalobjectsbutlittleabouthowobjectsoriginate.

Thischapterexaminesinstructionalobjectsinthecontextofacomplexinstructional

designspace.Weproposethedimensionsofthisspaceandtousethatasabackground

forrelatingtogetherthemultipledefinitionsoftheinstructionalobject.Wethentryto

situatethenewconstructwithinacontextofdesignactivitiesthatdiffersfromtraditional

designprocessviews.Wefinishbydescribingcriteriaandmethodologyguidelinesfor

generatingobjects.

Astheinstructionalobjectcontinuestotakeondefinitionandproportions,andasworkin

manyfieldsconverges,webelieveinstructionalobjectsinsomeformwillbecomea

majorfactorinthegrowthandproliferationofcomputer-basedinstructionand

perfbnnancesupporttechnology.

AnalysisandInstructionalObjects

Thelong-rangepurposeofthisresearchistoconsolidateatheoryofinstructionaldesign

thatusesthe“model”asacentraldesignconstruct.Suchabasewillsupportsystematic

futureresearchintoproductvarieties,productarchitectures,productionefficiencies,and

specializedproductivitytools.Bydoingso,wearehopingtolinkthepracticeof

instructionaldesignerswithnewdesignconstructsimpliedbycurrentviewsofinstruction

thatareshiftingtowardstudent-centered,situated,problem-based,andmodel-centered

experiences-onesthatarealsoshapedbythedemandsofscalingandproduction

efficiency.

Webelievethatthisdiscussionistimely.EvenastheinstructionaluseoftheWorldWide

Webisbeingpromotedwithincreasingurgency,thereareseriousquestionsconcerning

whetheritisfullyprovidedwithdesignconcepts,architectures,andtoolsthatfititfor

serviceasachannelforinstructingratherthanmerelyinforming(Fairweather&Gibbons,

2000).Atthesametime,instructionaldesigntheoristsarequestioningtheassumptions

underlyingexistingdesignmethodologiesthatareprovingbrittleinthefaceofchallenges

posedbythenewerinstructionalmodes(Gordon&Zemke,2000;Reigeluth,1999;

Edmonds,Branch&Mukherjee,1994;Rowland,1993).Theinstructionalobjecthasbeen

proposedwithindifferentspecialtyfieldsforitsproductivitybenefits,forits

standardizationbenefits,andasameansofmakingdesignaccessibletoagrowingarmy

ofuntraineddevelopers.Asthedesignprocessevolvesatheoreticbase,wefeelit

importanttoaskhowthattheorybasecanberelatedtoinstructionalobjects.

StandardsandCBITechnology

Theindustrythatfocusesonthedesign,development,anddeliveryofcomputerized

instructioniscurrentlyundergoingaperiodofstandardsettingfocusedonthedistribution

ofinstructionalexperiencesovertheInternetandWorldWideWeb.Theinstructional

object—indexedbymetadata—hasgreatpotentialasacommonbuildingblockfora

diverserangeoftechnology-basedinstructionalproducts.Massiveeffortsinvolving

hundredsofpractitioners,suppliers,andconsumersarecontributingtoobjectstandards

thatwillallowthisbuildingblocktobecomethebasicunitofcommerceininstruction

andperformancesupport(Hill,1998).

Itishardtoresistcomparingtheseeventswitheventsinthehistoryofthesteel-making

technology.WhenFrederickTaylorshowedintheopeningyearsofthe20thcenturythat

reliablerecipesforsteelcouldbeplacedintothehandsofrelativelyuntrainedfurnace

operators(Misa,1995),anarmyofnewandless-trainedbutfullycompetentfurnace

operatorsbegantotakeoverthemills.Greaterquantitiesofsteel(industrialscale)could

beproducedatmorepreciselycontrolledlevelsofquality.Threekeyeventsinthe

expansionofsteelmakinginvolvedepochsofstandardsettingcarriedoutbythree

differentstandardscoalitions.Overseveraldecades,thesecoalitionsarbitratedthe

measuresofproductqualityforrailsteel,structuralsteel,andautomotivesteel

respectively.Witheachnewstandard,theindustryprogressedandexpanded.Thisinturn

ledtoevenmorerapidexpansionanddiversificationoftheuseofsteelinotherproducts.

Steelstandardspavedthewayfor:(1)theachievementofmorepreciseandpredictable

controloversteelmanufacturingprocesses,(2)astandard-basedproductthatcouldbe

tailoredtotheneedsoftheuser,and(3)theabilitytoscaleproductiontoindustrial

proportionsusingthenewprocesses(Misa,1995).Withoutthesedevelopments,steel

qualitywouldstillbehighlyvariable,steelproductswouldhaveamuchnarrowerrange,

andsteelmakingwouldstillbeessentiallyanidiosyncraticcraftpracticedbyhighly

trainedandapprenticedfurnaceoperators.

TheNatureofInstructionalObjects

Wedefineinstructionalobjectsinalatersectionofthischapterbyrelatingthemtoan

architectureformodel-centeredinstructionalproducts.Asweusetheterminthischapter,

instructionalobjectsrefertoanyelementofthatarchitecturethatcanbeindependently

drawnintoamomentaryassemblyinordertocreateaninstructionalevent.Instructional

objectscanincludeproblemenvironments,interactivemodels,instructionalproblemsor

problemsets,instructionalfunctionmodules,modularroutinesforinstructional

augmentation(coaching,feedback,etc.),instructionalmessageelements,modular

routinesforrepresentationofinformation,orlogicmodulesrelatedtoinstructional

purposes(management,recording,selecting,etc.).

Theliteratureinanumberofdisciplinesthatcontributetoinstructionaltechnology

describesobjectsthatperformsomesubsetofthefunctionsrequiredofthedifferentkinds

ofinstructionalobject:

•Objectsinvolvedindatabasestructuring

•Objectsforthestorageofexpertsystemknowledge

•Objectsfordocumentformatcontrol

•Objectsusedfordevelopmentprocesscontrol

•Modular,portableexperttutors

•Objectsrepresentingcomputerlogicmodulesforusebynon-programmers

•Objectsformachinediscoveryofknowledge

•Objectsforinstructionaldesign

•Objectscontaininginformationalormessagecontent

•Objectsforknowledgecapture

•Objectsthatsupportdecisionmaking

•Objectsfordatamanagement

Allofthesetypesofobjectandmoreareneededtoimplementinstructionthroughthe

real-timeassemblyofobjects.Gerard(1969)inasurprisinglyvisionarystatementearly

inthehistoryofcomputer-basedinstructiondescribeshow"curricularunitscanbemade

smallerandcombined,likestandardizedMeccano[mechanicalbuildingset]parts,intoa

greatvarietyofparticularprogramscustom-madeforeachlearner,,(p.29-30).Thirty

yearslater,thevalueandpracticalityofthisideaisbecomingapparent.

BasicIssues

Tosetthestageforthediscussionofinstructionalobjectorigins,itisessentialtotouch

brieflyontwoissuesrelatedgenerallytothedesignanddevelopmentoftechnology­

basedinstruction:

•Thegoalsofcomputerizedinstruction:adaptivity,generativity,andscalability

•Thestructureofthetechnologicaldesignspace

TheGoalsofComputerizedInstruction:Adaptivity,Generativity,andScalability

Fromtheearliestdaysofcomputer-basedinstructionasatechnology,thegoalhasclearly

beencreatinginstructionthatwas:(1)adaptivetotheindividual,(2)generativerather

thanpre-composed,and(3)scalabletoindustrialproductionlevelswithoutproportional

increasesincost.

NowherearetheseidealsmoreclearlystatedthaninComputer-AssistedInstruction:A

BookofReadings(1969a),aground-breakingandinmanywaysstillcurrentvolume

editedbyAtkinsonandWilson.Virtuallyallofthechaptersselectedforthebookbuild

onthethreethemes:adaptivity,generativity,andscalability.

Adaptivity:AtkinsonandWilsoncredittherapidrateofgrowth(before1969)inCAIin

part“totherichandintriguingpotentialofcomputer-assistedinstructionforanswering

today'smostpressingneedineducation-theindividualizationofinstruction^^(Atkinson

&Wilson,1969b,p.3).TheydistinguishCAIthatisadaptivefromthatwhichisnot,

attributingthedifferenceto"'responsesensitivestrategy.^^Suppes(1969)foresees“akind

ofindividualizedinstructiononcepossibleonlyforafewmembersofthearistocracy^^

thatcan“bemadeavailabletoailstudentsatalllevelsofabilities”(p.41).Thisdurable

argumentisbeingusedcurrentlytopromoteinstructionalobjectstandards(Graves,1994).

Suppes(1969)describeshowcomputerswill“freestudentsfromthedrudgeryofdoing

exactlysimilartasksunadjustedanduntailoredtotheirindividualneeds.^^(p.47).

Stolurow(1969),describingmodelsofteaching,explains:

...mustbecybernetic,orresponse-sensitive,ifitisadaptive.Amodelfor

adaptive,orpersonalized,instructionspecifiesasetofresponse-dependentrules

tobeusedbyateacher,orateachingsystem,inmakingdecisionsaboutthe

natureofthesubsequenteventstobeusedinteachingastudent.(p.69-70)

Heintroducesan44ideographic^^instructionalmodelthatdesignsfor“possibilities“rather

thanplansforspecificpaths:"weneedwaystodescribethealternativesandweneedto

identifyusefulvariables^^(p.78).Stolurowmakestheimportantdistinction"between

branchingandcontingencyorresponse-producedorganizationfofinstruction]”(p.79).

TheseandmanyotherthingsthatcouldbecitedfromtheAtkinsonandWilsonvolume

makeitclearthatadaptivitywasaclosely-heldearlygoalofcomputer-basedinstruction.

Incidentally,theseandotherstatementsinthebookmakeitclearthatCAIwasnot

envisionedbythesepioneersassimplycomputerizedprogrammedinstruction.

Generativity:Generativityreferstotheabilityofcomputerizedinstructiontocreate

instructionalmessagesandinteractionsbycombiningprimitivemessageandinteraction

elementsratherthanbystoringpre-composedmessagesandinteractionlogics.The

contributorstoAtkinsonandWilsondescribemainlypre-composedinstructionalforms

becauseintheearlydaysofCAItherewerenotoolstosupportgenerativity,butmany

AtkinsonandWilsonpaperauthorsemphasizefuturetoolingforgenerativity.

Suppes(1969),wholaterproducedmathproblemgenerationtoolshimself,describes

threelevelsofinteractionbetweenstudentsandinstructionalprograms,allofthem

subjecttosomedegreeofgenerativity:(1)individualizeddrill-and-practice,(2)tutorial

systemsthat"approximatetheinteractionapatienttutorwouldhavewithanindividual

student,and(3)dialoguesystems""permittingthestudenttoconductagenuinedialogue

withthecomputer^^(p.42-44).

Silberman(1969)describestheuseofthecomputertogeneratepracticeexercises(p.53).

Stolurow,describingtheinstructionalrulesofanadaptivesystemsaid:

Theserules[forcontrollingpresentationofinformation,posingofa

problem,acceptanceofaresponse,judgingtheresponse,andgivingfeedback]

alsocanbecalledorganizingrules;theyaretherulesofaninstructionalgrammar.

Eventuallyweshoulddevelopgenerativegrammarsforinstruction.(p.76)

Scalability:TheauthorsoftheAtkinsonandWilsonvolumeweresensitivetothe(then)

highlyvisiblecostsofcomputer-assistedinstruction.Theirsolutionstoscalabilitywere

projectionsoflowercomputercosts,expectationsforlargermulti-terminalsystems,and

calculationsofproductcostspreadoverlargenumbersofusers.Theconnectiveand

distributivetechnologyofthedaywasthetime-sharedmonolithiccentralizedmainframe

systemand(then)high-costandlow-qualitytelephonelines.

Thegoalsofadaptivity,generativity,andscalabilitythatprevailedin1969arestillkey

targets.Thesegoalswereadoptedbyresearchersinintelligenttutoringsystems,andthey

areclearlyevidentinthewritingsofthatgroupofresearchers,especiallyinthe

occasionalsummariesofthefieldanditsevolvingtheoryandmethod(Wenger,1987;

Psotka,Massey,&Mutter,1988;Poulson&Richardson,1988;Burns,Parlett,&

Redfield,1991;Noor,1999).

BurnsandParlett(1991)tellusto,“Makenomistake.ITSsaretryingtoachieveone-on-

oneinstruction,andthereinliesthecomplexityandthenecessaryflexibilityofany

potentiallyhonestITSdesign.”

TodaythetutorialsystemsanddialoguesystemsdescribedbySuppesstillrepresent

cuttingedgegoalsforintelligenttutoringsystems.Generativityisstillclearlyapartof

thebasicgameplan.ThisisevidentinthegoalsoftheDepartmentofDefenseAdvanced

DistributedLearningSystemInitiative(AdvancedDistributedLearningInitiative,no

date).AsBurnsandParlett(1991)explain,

ITSdesignershavesetuptheirownholygraii.Thegrailis,asyoumight

haveguessed,thecapabilityforalarge-scale,multiuserknowledgebaseto

generatecoherentdefinitionsandexplanations.Itgoeswithoutsayingthatifa

studenthasareasonablequestion,thenanITSshouldhaveananswer,(p.6)

Thepersonalcomputer,thenetwork,andrapidlyproliferatingcommunications

connectivityhavebecomethestandard.Becauseofthis,ourfocusonscalabilityhas

shiftedfromdeliverycoststodevelopmentcosts.Oneoftheforcesbehindthe

instructionalobjectsphenomenonistheprospectofloweringproductcoststhrougha

numberofmechanisms:reusability,standardizedconnectivity,modularitytooptimize

transmissionfromcentralstores,andstandardizedmanufacture.

TheStructureoftheTechnologicalDesignSpace:TheConvergenceZone

Technologiesoftendevelopfirstasadhocsystemsofpracticethatlatermustbe

groundedintechnologicaltheoryandformamutuallycontributoryexchangewith

scientifictheory.Instructionaltechnologyisseekingitstheoreticalfoundationsmore

vigorouslynowthaneverbefore(Merrill,1994;Reigeluth,1999;Hannafin,etal.,1997).

Webelievethatseveralcluestodevelopingamorerobusttheoreticalbasisfor

instructionaltechnologycancomefromstudyingtechnologyasatypeofknowledge­

seekingactivityandfromstudyingthetechnologicalprocess.

Technologyconsistsofthehumanworkaccomplishedwithina"convergencezone"

whereconceptualartifacts(designedstructures,constructarchitectures)aregivenspecific

formwithmaterials,information,andforce-informationtransfermechanisms.Inthis

convergencezone,conceptualartifactsarelinkedwithmaterialoreventartifactsthat

expressaspecificintention.InadiscussionoftheWorldWideWebandModel-Centered

Instruction,Gibbonsandhisassociates(Gibbons,etal.,inpress)describethis

convergencezoneintermsofconceptualinstructionalconstructsbeingrealizedusingthe

programmingconstructsofaparticularsoftwaretool.

Thisistheplacewherethedesigner'sabstractinstructionalconstructsand

theconcretelogicconstructssuppliedbythedevelopmenttoolcometogetherto

produceanactualproduct.Atthispoint,theabstracteventconstructsaregiven

expression-ifpossible-bytheconstructssuppliedbythedevelopmenttool.

BurnsandParlett(1991)provideaglimpseofthisboundaryworld:

ProposedarchitecturesforrepresentingteachingknowledgeinITSscanbe

describedintermsofhowknowledgeisunderstoodbyexpertsandhowitcanbe

representedbyprogrammersinsetsofdomain-independenttutoringstrategies,(p.

5-6)

HerbertSimon,inSciencesoftheArtificial,describesthisconvergencezonebetweenthe

abstractworldandtheconcreteworldasakeytounderstandingtechnologicalactivityin

general:

Ihaveshownthatascienceofartificialphenomenaisalwaysinimminent

dangerofdissolvingandvanishing.Thepeculiarpropertiesoftheartifactlieon

thethininterfacebetweenthenaturallawswithinandthenaturallawswithout.

Whatcanwesayaboutit?Whatistheretostudybesidestheboundarysciences一

thosethatgovernthemeansandthetaskenvironment?

Theartificialworldiscenteredpreciselyonthisinterfacebetweenthe

outerandinnerenvironments;itisconcernedwithattaininggoalsbyadaptingthe

formertothelatter.Theproperstudyofthosewhoareconcernedwiththe

artificialisthewayinwhichthatadaptationofmeanstoenvironmentsisbrought

about-andcentraltothatistheprocessofdesignitself.Theprofessionalschools

willreassumetheirprofessionalresponsibilitiesjusttothedegreethattheycan

discoverascienceofdesign,abodyofintellectuallytough,analytic,partly

formalizable,partlyempirical,teachabledoctrineaboutthedesignprocess,(p.

131-2)

Simonemphasizesthefragilityoftheconnectionsacrosstheinterfacebetween

conceptualandreal:theinterfaceisdifficulttoimagineintheabstract,anditisnot

surprisingthatmanydesigners-especiallynoviceones-focustheirattentionmainlyon

thematerialresultofdesigningratherthanonitsconceptualprecursors.Infact,aswe

explaininalatersectionofthischapter,thefocusofdesignersonaparticularsetof

designconstructsallowsclassificationofdesignersintoanumberofbroadclasses.

DimensionsoftheDesignSpace

Technologistswhosucceedinvisualizingthisconceptual-materialboundarycanbe

baffledbyitscomplexity.Designsareneverthesimple,unitaryconceptionsthatwe

describeintextbookterms.Instead,theyaremulti-layeredconstructionsofmechanism

andfunctionalitywhoseinterconnectionsrequireseveraltransformationallinkstoreach

acrosstheconceptual-materialboundary.Linksandlayersbothmustarticulateindesigns

suchthatinterferencebetweenlayersisminimizedandthefutureadaptabilityofthe

artifacttochangingconditionsismaximized-thefactorthatgivestheartifact

survivability.Automateddesignsystemsprovideprincipledguidanceforthosedecisions

thatcannotbeautomatedanddefaultvaluesforthosethatcan.

Brand(1994)describestheprincipleoflayeringindesignsbydescribingthelayered

designofbuilding—inwhathecallsthe"6-S"sequence:

•SITE-Thisisthegeographicalsetting,theurbanlocation,andthelegally

definedlot,whoseboundariesandcontextoutlastgenerationsofephemeral

buildings.46Siteiseternal,44Duffyagrees.

•STRUCTURE-Thefoundationandload-bearingelementsareperilousand

expensivetochange,sopeopledon't.Thesearethebuilding.Structurallife

rangesfrom30to300years(butfewbuildingsmakeitpast60,forother

reasons).

•SKIN-Exteriorsurfacesnowchangeevery20yearsorso,tokeepwith

fashionandtechnology,orforwholesalerepair.Recentfocusonenergycosts

hasledtoreengineeredSkinsthatareair-tightandbetterinsulated.

•SERVICES-Thesearetheworkinggutsofabuilding:communications

wiring,electricalwiring,plumbing,sprinklersystem,HVAC(heating,

ventilating,airconditioning),andmovingpartslikeelevatorsandescalators.

Theywearoutorobsolesceevery7to15years.Manybuildingsare

demolishedearlyiftheiroutdatedsystemsaretoodeeplyembeddedtoreplace

easily.

•SPACEPLAN-Theinteriorlayout-wherewalls,ceilings,floors,anddoors

go.Turbulentcommercialspacecanchangeevery3yearsorso;exceptionally

quiethomesmightwait30years.

•STUFF-Chairs,desks,phones,pictures,kitchenappliances,lamps,hair

brushes;allthethingsthattwitcharounddailytomonthly.Furnitureiscalled

mobiliainItalianfbrgoodreason,(p.13)

Theagingoflayersatdifferentratessuggeststhatlayersshouldbedesignedto"slip”past

eachothersothatwhentheyrequirechange,update,renewal,orrevisionondifferent

timecyclesthatcanbeaccomplishedwithoutrazingthewholestructure.Brandrelates

theessentialinterconnectionsbetweentheselayerstothelongevityoftheartifact:

Adesignimperativeemerges.Anadaptivebuildinghastoallowslippage

betweenthedifferently-pacedsystemsofSite,Structure,Skin,Services,Space

plan,andStuff.Otherwisetheslowsystemsblocktheflowofthequickones,and

thequickonestearuptheslowoneswiththeirconstantchange.Embeddingthe

systemstogethermaylookefficientatfirst,butovertimeitistheopposite,and

destructiveaswell.(p.20)

Brandexplainsthat”the6-Ssequenceispreciselyfollowedinbothdesignand

construction.^^Eachlayerofadesignpresentsaseparatedesignsub-problemtothe

designer.Layersmustpossesstheirowndesignintegrity,butthestructuresofeachlayer

mustarticulatewiththestructuresoftheotherlayers.

Figure1suggeststhedegreeofmulti-stagingandmulti-layeringatSimon'stechnology­

producing“interface”byillustrating:

(1)Designlayers(theverticaldimensionofthefigure)astheymightbedefined

forinstructionaldesigners

(2)Theprogressivesequenceofintegrationsorconstruct-to-constructlinks(the

horizontaldimensionofthefigure)throughwhichtheoriginalconceptionofa

designemergesintoanactualartifact

(3)Theinterconnections(angledlines)betweenthelayersofadesignshowthat

eachlayercanbearticulatedwitheveryotherlayer.

.Simon'sInterface>

DesignConstructs\

ModelConstructs

ProblemG

BStrategyConstructs

r

a

n

d

/

L

aConstructs

y

e

sr

Representati01

▼Media-LogicConstructs

Figure1.Multi-stagingandmulti-layeringofaninstructionaldesignspace.

Asadesignprogressesfromtheconceptualstagetotherealartifactstage,the

integrationofthelayersincreasestothepointwhereabstractdesignandconcreteproduct

layerscanbarelybedistinguished.Thusthestructureandservicelayersofabuilding

disappearbehindcoveringwallsandexteriorskin;thusthemodelandmedia-logiclayers

ofaninstructionalartifactdisappearbehindthestrategyandsurfacerepresentationlayers.

Sincethetangiblesurfacelayersofadesignarewhatweexperience,itisnotsurprising

thatnewdesignersfailtoseethemultiplelayersofstructurethatareactuallydesigned.

Thisistypicalwithbuildingdesigns,anditisespeciallytypicalwithinstructionaldesigns.

Instructionaldesignerscanbeclassifiedgenerallyintermsoftheconstructstheyenvision

withinadesign-theconstructsthereforethattheyaremostliabletousetocreatethe

centralstructuresoftheirdesigns:

•Me如-centricdesignerstendtoconcentrateonmedia-relatedconstructsand

theirarrangement(e.g.,manuals,pages,cuts,transitions,synchronizations,

etc.)

•Message-centricdesignerstendtoconstructsrelatedto4ttellingMthe

instructionalmessageinawaythatsupportsitsrapiduptakeandintegration

withpriorknowledge(e.g.,analogy,advanceorganizer,useofconceptual

figures,dramatization,etc.)

•Strategy-centricdesignersprefertoplacestructuresandsequencesofstrategic

elementsatthecenteroftheirdesigns(e.g.,messagecomponentization,

interactionpatterns,interactiontypes,etc.)

•Mode/-centricdesignerstendtobuildtheirdesignsaroundcentral,interactive

modelsofenvironments,cause-effectsystems,andperformanceexpertiseand

supplementthemwithfocusingproblemsandinstructionalaugmentations

Designerstendtomovethroughthese“centrisms“aspersonalexperienceaccumulates

andthevalueofnew,lessvisible,subtlerconstructsbecomesapparenttothem.With

eachmovetoanewviewpointthedesignergainstheuseofthenewdesignconstructs

withoutgivinguptheoldones,sothischangeresultsintheaccumulationoffundamental

designbuildingblocks.

Wheninstructionalobjectsareusedindesign,theyareconstructswithinSimon'sdesign

space.Theycantheoreticallybemedia,message,strategy,ormodelobjectsorany

combinationoftheseinteractingacrossseverallayers.Theycanrepresentafunctional

instructionalproducthavingamany-layereddesignorasingleelementthatcanbe

integratedatthetimeofinstructionintoproductstosupplysomemodularfunctionalityin

acooperativeway.

TheOriginofInstructionalObjects

Priortothenotionofinstructionalobjects,descriptionsoftheinstructionaldesignprocess

havebeencouchedintheterminologyofotherkindsofconstructsconsideredtobe

producedatsomepointduringdesign.

Figure2depictsthetraditionalISDprocessinrel