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In the past few years, programming methods in general use have tended to emphasize modularity of program design; not only for large, complex programs, but even for those of relatively modest size. A common method for achieving modularity has been to divide the program into (relocatable) segments, because: • Coding and checkout of the individual segments can proceed in parallel, thereby considerably reducing the time between analysis of the problem and availability of a running program. • Modifications to the program, which are usually confined to a few segments, can be accomplished without the necessity of reassembling the entire program. • Duplication of effort can be minimized by taking advantage of libraries of previously checked-out subroutines. Different programming techniques can be used for the various segments, thus allowing the exploitation of the strong points of a particular language or processor.
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