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mainChurchman_systemtheory, Level (Importance to System) are bad parts,fixable without disturbing sstem, Decompostion of Systems main focus is parts in relationship to whole, Ely & Plomp, pp. 39-46: Churchman, C. W. (1965). On the design of educational systems. Audiovisual instruction, 10(5), 361-365. considers A PHILOSOPHICAL QUESTION: 'How to best work with systems?', Level (Importance to System) are parts may have become obsolete because system has changed, sytem optimization evaluates cost/benefit, Decompostion of Systems goal is sytem optimization, "housekeeping" goal is keeping parts in working order, Level (Importance to System) are bad part, once identified, easy to fix, parts cost/difficulty of fixing varies with Level (Importance to System), "housekeeping" main focus is parts