 commun pattern appli technolog the preced paper address studi flow stream human activ various call scienc pure scienc basic fundament secondarili concern practic util product at point appropri note parallel activ includ appli exploratori develop engin develop thi second stream call technolog far flow scientist technologist from knowledg led conclud commun pattern area activ independ qualit natur thi differ reflect clearli mechan diffus set practition the paper address differ discuss natur commun process scienc technolog 