-Principle 5: build incrementally from solid foundationIn this principle the developer need to give out the first test product as soon as possible, and to collect user opinion for evaluation and improvement. This process is repeated continuously throughout the production process. The benefit is that once the final product is unveiled. It would be almost perfect version and almost no errors occur because the process of testing and continuous improvement. In one the other hand, this process requires the focus and intensity of the continuous work of the members participated in the project. Working overtime is unavoidable, and can affect the health of the participants of the project-Principle 6: iterative developmentThis development method is very effective for a project needs to improve as many times as the NW. This can be seen as the best way to complete the project with the highest possible accuracy. Just the development team always adheres to the principle of circulation and time boxing was proposed in the original plan, keep improving and testing in the process of completing the project, the final product will certainly achieve success beyond expectation.-Principle 7: constant communication and clearDuring the project development process, members must have constant interaction with each other, often talks about the difficult issue encountered. The communication process requires that members must really trust each other to avoid internal conflicts arise, solidarity sought out suitable solution in every situation. -Principle 8: the control:Sally's team is planning to closely control each stage of the project. The study reviews the level of completion for each phase. This helps the product constantly improve on the quality and features in the development stage
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