The summarize from Agile Game Development with Scrum and What is Scrum? says, scrum model has three main phases. First is planning, the developer has to work together with employee to plan the project followed in requirement. They’re planning before develop the application. Discuss, what the important feature is and design the interface. The second phase is sprint cycle, which is an iterative cycle until the actual development of the product is done. It start with develop the most important thing. After finish the product will have to review or test. And then adjustment to make the project followed in requirement. This phase is repeated until the product’ development is complete. So it will complete when everything as cost and quality are balance. The last phase is closure, the product’ development is actual complete and released.