 inform need us scienc technolog the scientist engin system dispos demand satisfact achiev effort result impact work item knowledg wise plan scienc system polici besid matter great signific behavior scientist interest human organ commun while user studi serv function 1963 take-off point empir scientist technologist for volum annual review cover studi appear month 1963 reader round pictur period area wit progress line substanti advanc systemat fruit applic techniqu critic incid appear field earlier rigor form the introduct promis approach solut develop record comparison team work ident task appli field an increas number effort comprehens studi inform-flow situat disciplin american psycholog associ 3 model envi area 