Question Four

Myers $[1978$b$]$ quantified the ideas of module cohesion, the degree of interaction within a module, and module coupling, the degree of interaction between two modules. To be more precise, Myers used the term strength rather than cohesion. However, cohesion is preferable because modules can have high strength or low strength, and something is inherently contradictory in the expression low strength $-$something that is not strong is weak. To prevent terminological inexactitude, C$/$SD now uses the term cohesion. Some authors have used the term binding in place of coupling. Unfortunately, binding also is used in other contexts in computer science, such as binding values to variables. But coupling has none of these overtones and therefore is preferable.

In an essay format, name and explain the seven different levels or categories of cohesion, starting from worst to best. In a separate paragraph, name and explain the five different levels of coupling, starting from worst to best. $(25)$