Question

Each of the following heuristics helps make a good module according to some implement ability or aesthetic principle. Identify the principle.

(a) Eliminate irrelevant classes from your design.

(b) Do not nest control structures more than seven levels deep.

Answer 1

a) Eliminating irrelevant classes from your design comes under Class Heuristic principle .

It is the simplest type of heuristics that acts upon individual classes.They evaluate class properties pertaining to method complexity,size,behavioral content and encapsulation.As we know ,When the number of classes increases it becomes harder to maintain and modify So,Class Heuristics eliminates the extra classes to make the design simple and efficient.

b) Do not nest control structures more than seven levels deep it comes under Relationship Heuristic Principle.

  A relationship heuristic are defined for the inheritance ,aggregation and using class relationships.A relationship heuristic acts upon a group of classes,that participates in a specific class relationships.As we know,increase in inheritance increases complexity of a class. So,Relationships heuristic principle limits the inheritance up to level seven.