Because of the way Drupal is constructed, you cannot install two versions of the same module in the sites/all/modules/ directory. Attempting to do this will lead to fatal errors or, even worse, subtle bugs that arise from certain loading errors.
A traditional waterfall method breaks the workflow down into stages. You complete one phase of the production life-cycle before continuing to the next. The names of the steps are up to you and can vary and are usually tailored to your organization's style or terminology already in use. Make it work for you. The objectives of the waterfall method are to complete one phase before moving on to the next and to have the output from each task feeding into the next so that there's a logical progression of development.
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