Here is a link to a useful and interesting overview of the Software Development Life Cycle “SDLC.”
An interesting read for anyone new or just getting into software development. It does appear to outline a some what Waterfall approach in the body of the article – which these days is a method no longer used, or being used less and less. However, at the bottom it does out line different models for software development including that of Agile and Waterfall.
I would also add that it’s really important to test as you proceed the build and not to start testing once the build is completed!
Stage 5: Testing the Product
This stage is usually a subset of all the stages as in the modern SDLC models, the testing activities are mostly involved in all the stages of SDLC. However this stage refers to the testing only stage of the product where products defects are reported, tracked, fixed and retested, until the product reaches the quality standards defined in the SRS.