General Software Design Concepts Implementations of the general principles · Decomposition Can decompose with respect to time order, data flow logical groupings, access to a common resource control flow or some other criterion Functional decomposition seems to be a natural way for people to solve problems as evidenced by its wide use Top-down decomposition: start at high levels of abstraction and progress to levels of greater and greater detail Bottom-up: form and layer groups of instruction sequences until work way up to a complete solutionCopyright Nancy Leveson, Sept. 1999 General Software Design Concepts Implementations of the general principles Decomposition Can decompose with respect to time order, data flow, logical groupings, access to a common resource, control flow, or some other criterion. Functional decomposition seems to be a natural way for people to solve problems as evidenced by its wide use. Top-down decomposition: start at high levels of abstraction and progress to levels of greater and greater detail. c Bottom-up: form and layer groups of instruction sequences until work way up to a complete solution. �