The key to a successful custom solution begins with a detailed planning process that defines the scope of the module. A list of requirements are generated and only then is a solution proposed. The proposal also includes the time required to complete the development of the custom Drupal module. Once all details of the solution and the implementation strategy are agreed on, the development process can begin.
The development stage consists of programming the custom module. Once the development is complete the implementation of the module can accurately be achieved.
This two-stage process assures the result desired: a successful outcome.