One of the measures of good system design is how costly, difficult, or intrusive it is to make changes to that system. Consider the problem of a business owner who has decided to use neon for his store-front signage. Neon signs, in which data (information) presentation is bound together with the sign itself, may have to be completely rebuilt to make even a relatively simple change. As a result, any update to that signage is going to take time and money and will limit the owner’s ability to advertise whatever content he wanted on that sign. In addition, the change requires special expertise—expertise that the owner or his staff may not possess. The choice of neon is an example of a tightly coupled solution. On the other hand, digital signage is quick and easy to update, costs very little, and requires no special training to execute. This is a loosely coupled option.

Another measure of good design is simplicity. It is easier to follow and execute simple and distinct directions than complex and muddled ones. The same holds true for objects within a system. Objects that perform one distinct activity are easier to understand and to create than objects that have a multitude of functions and activities. “Single-minded” objects (as your text refers to them) have high cohesion. Multi-functional objects have low cohesion.

In this Discussion, you examine the goals of coupling and cohesion and the approaches to design you use to achieve those goals for your design.

Using your readings from this unit and the Internet, examine the concepts of coupling and cohesion as they are defined and used in both an object-oriented design approach and in a structured design approach.

Thinking as a systems analyst, which approach best enables you to design a system that meets the goals of low coupling and high cohesion? Why? Support your position with examples (e.g., functional, sequential, communicational, or iterative).

Defend and support your opinion and cite your sources according to APA guidelines.

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