A module should be a self-contained unit of code. It should be as independent as possible, with an interface that communicates with other modules.
All software projects have risks.
Risks can affect how long it takes to complete a project and how much it costs The program can also affect the success of a business, or the lives of people. An assertion is a statement about the state of the data at a certain point in the algorithm. Preconditions and postconditions are assertions. Actually, it is relatively minor part. It is just translating the design into the computer language and removing the syntax errors.