Quick and Dirty:
This is the most ideal if you are developing a prototype or proof of concept. The objective is to get the application working and quickly. The quality is not set at the high water mark level for the specs, design and programming. It delivers the working prototype in the most quickest and efficient manner. Allows for any skill can be used for a short duration. Since the duration is short, the team that started the work will always complete the project. Specifications can be provided in the easiest format possible. There is no rigorous QA done on each phase. Documentation will be provided to the extent that it is required to install and use the prototype. Software engineering principles are followed to allow for quick development and delivery. The focus is always on delivery.