Agile planning and development methods

Agile Development is a kind of iterated software development method. Its basic concept is people-centered. Estimate and scheme of Agile Methodologies are different from the traditional ones. Most papers at home and abroad about Agile Development mainly concentrate the contrast and fusion between Agile Development and traditional methods. However, researches about estimate of Agile Development procedure are lesser. This paper introduces basic methods of agile planning based on author's practice experience from two aspects: release plan, estimation of iteration, and then lists three popular agile methodologies: Xp, scrum and crystal. Finally it summarizes the whole paper.