02488nas|a2200241 i 450000500170000000800410001703500150005810000190007324500670009226000520015930000140021149000270022550001440025250200580039652014390045465000370189370000350193070000490196570000470201471000610206181000590212285600650218120260818223503.0130598s1980    th  uzm rtt  00|  a1eng d  a.b106561941 aWang, Doe-Ming10aSupporting the structured development of PL/I software systems  aBangkok :bAsian Institute of Technology,c1980  aiv, 45 p.1 aThesis ;vno. CA-80-20  aA thesis submitted in partials fulfilment of the requirements for the degree of Master of Engineering, School of Engineering and Technology  aThesis (M.Eng.) - Asian Institute of Technology, 1980  aIn recent year s, Chief Programmer Team, Top-Down  Development, Structured Programming, and Development Support Library which represent the organization, design strategy, programming technique and supporting tool respectively have been treated as a hierarchical set of components in developing a reliable software system. In this study, Top-Down Development (in particular, the structure of  modular programs as in Turner (1980)) and Development  Support Library are studied. It is assumed that the pure  tree structure is the best way to organize program modules  when designing any software system. A software tool called  PL/I Support System (PLISS) is designed and implemented to  support the development of software system in pure tree  structure.  The application of Top-Down Development tends to  proliferate the number of independently compiled modules  that comprise the system and al so places certain demands on  the language used for actual system implementation. These  demands deal primarily with (1) specifying intermodule  relationship; (2) propagating intermodule modification; and  (3) Maintaining consistency in the realization of abstraction. In this thesis, we discuss the implications of these demands on a specific language PL/I. From this discussion the PL/I Support System based on a Programming Production Library is established. Finally, the elements and the functions of PL/I Support System are described. 10aPL/I (Computer program language)1 aGupta, Gopal K., eChairperson0 aKrisorn Jittorntrum, eExamination Committee1 aHuynh, Ngoc Phien, eExamination Committee2 aRet-Ser Engineering Agency (R.O.C.), eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. CA-80-20  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B21940