spiral methodology provides an iterative and progressive approach to defining the requirements and design of your site using prototyping. Once an operational prototype is reached, the development phase of production starts and you proceed using a waterfall approach. The spiral model suggests that a series of four steps be performed before coding begins. The following briefly describes the activities in each pass of the spiral, starting in the center of the spiral.
1. Determine your objectives, your alternatives for meeting your objectives, and any constraints that must be met.
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.
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.
When using open source systems, you can use thousands of features simply by turning them on. You don't have to create the code for the functions you need, just activate them; saving time and money. It's pretty cool stuff. But, the benefit in using open source systems can also be a big challenge when it comes to coordination different aspects of a project. Not everything exists in harmony- even when it is easy to turn on or off- and project planning/development methodologies can mean the difference between reaching your goal and just not.
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