"..the human mind can only deal with a relatively small number of independent pieces of data at one time, but if data are chunked together in appropriate ways, the mind can perform higher order abstractions, and these in turn can be chunked together, with successive abstractions, until an entire complex situation is encompassed. The systems approach addresses this property of the human mind by providing strategies for the data gathering, chunking, and abstracting process." George G. Lendaris, On Systemness and the Problem Solver: Tutorial comments 1983.
The following table uses a systems strategy of multiple perspectives to help identify subsystems and how OpenACS works. Areas are linked for further information.
|OpenACS by context, showing subsystems versus roles|
|Community, organizational (external)||Guest||Registered user||Moderator (special)||Package admin||Sitewide admin|
|User interface||web-based interface|
|embeded, programming language interpretor||n/a|
|database procedural language (PL/SQL, PL/PgSQL)||n/a|
|high-performance web server||n/a|
|operating system (file system, shell etc)||n/a||
following are not required for all systems
(for installing AOLserver, Tcl, PostgreSQL from source code)
n/a = not applicable
View source of this page to see working/draft notes
|Document Revision #||Action Taken, Notes||When?||By Whom?|
|0.3||Adding some table contents||26 May 2005||Torben Brosten|
|0.4||Adding some table contents, clarified doc||20 August 2005||Torben Brosten|