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The paper describes development (improvement/extension) approaches forcomposite (modular) systems (as combinatorial reengineering). The followingsystem improvement/extension actions are considered: (a) improvement of systemscomponent(s) (e.g., improvement of a system component, replacement of a systemcomponent); (b) improvement of system component interconnection(compatibility); (c) joint improvement improvement of system components(s) andtheir interconnection; (d) improvement of system structure (replacement ofsystem part(s), addition of a system part, deletion of a system part,modification of system structure). The study of system improvement approachesinvolve some crucial issues: (i) scales for evaluation of system components andcomponent compatibility (quantitative scale, ordinal scale, poset-like scale,scale based on interval multiset estimate), (ii) evaluation of integratedsystem quality, (iii) integration methods to obtain the integrated systemquality. The system improvement/extension strategies can be examined asseleciton/combination of the improvement action(s) above and as modification ofsystem structure. The strategies are based on combinatorial optimizationproblems (e.g., multicriteria selection, knapsack problem, multiple choiceproblem, combinatorial synthesis based on morphological clique problem,assignment/reassignment problem, graph recoloring problem, spanning problems,hotlink assignment). Here, heuristics are used. Various systemimprovement/extension strategies are presented including illustrative numericalexamples.

Improvement/Extension of Modular Systems as Combinatorial Reengineering (Survey)