Before revision: The first was Procedural Hierarchy of Issues (PHI), first described in Ray McCall ’ s PhD DissertationMcCall, R. (1978), On the structure and use of issue systems in design, Doctoral Dissertation, University of California, Berkeley, University Microfilms although not named at the time.
After revision: The first was Procedural Hierarchy of Issues (PHI), first described in Ray McCall ' s PhD DissertationMcCall, R. (1978), On the structure and use of issue systems in design, Doctoral Dissertation, University of California, Berkeley, University Microfilms although not named at the time.