Just read a bit about Software Development Processes. In particular, the 'Waterfall Model' (where progress flows sequentially from top to bottom through various phases) and 'Iterative and Incremental Development' (where progress is through cycles (iterative) and in smaller portions at a time (incremental)).
Regarding the former, an example of the phases (in order): Requirements specification; Design; Construction (AKA implementation or coding); Integration; Testing and debugging (AKA Validation); Installation; Maintenance.
Regarding the latter, a quote from Wikipedia: "Learning comes from both the development and use of the system, where possible key steps in the process start with a simple implementation of a subset of the software requirements and iteratively enhance the evolving versions until the full system is implemented. At each iteration, design modifications are made and new functional capabilities are added."
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