Effective Modular Design Heuristics
Once program structure is development effective modularity can be achieved by applying the design concepts illustrated in the previous section. The program structure can be manipulated according to the following set of heuristics.
1. Obtain the first iteration of the program structure as to reduce coupling and increase cohesion :After developing the program structure, modules may be exploded or improve module in dependence. An exploded module results in partitioning the logic into separate program. An imploded module result in the creation of two or more modules.
2. Try to minimize structures with high fan out strive for fan in as depth increases: Try to avoid the pan caked structure in which all the modules are under the control of a single module as shown in fig 5.23,
To avoid such type of pan caked structures a more reasonable distribution of control is required as shown in fig 5.24,
Fig 5.24, shown a number of layers of control
3. Keep the scope of effect of a module within the scope of control of that module: The scope of a particular module is defined as all modules that are affected by a decision made in this module. The scope of control of is all the a modules that are subordinate of module.
4. Obtain the module interfaces to reduce complexity and redundancy and improve consistency: Interface designing should be like so that information can be easily passed and consistent with the function of a module .
5. Define module whose function is predictable but avoid modules that are overly restrictive: A module is predictable when it will be produced irrespective of the internal functionality. And there should be mush restricted modules that should be avoided.
6. Strive for controlled entry modules by avoiding connections pathological :Software is easier to understand and therefore easier to maintain when module interfaces are constrained and controlled. Pathological connection refers to branches or references into the middle of a module.
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