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.
RAD stands for rapid application development. With this methodology you use structured techniques, and prototyping to set your requirements, get prototypes quickly and use minimal planning. It's essentially one process that wraps several stages into one (requirements, design and possibly even the development processes.) It's close to the agile mathod but the main difference is the use of prototyping.
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