Agile Project Management is an iterative and incremental approach to software development projects supported by a cross-functional team. It allows for flexibility and frequent delivery of product iterations, and enables teams to respond to changes quickly. Agile follows a framework, with detailed project planning and estimation for each sprint before execution. Accurate estimation is important for planning and managing the effort to deliver a new feature or product.  This extensive article covers four methods for estimating work: Planning Poker, Asynchronous, Relative Estimation, and Bucket Sizing, with explanations on how to use each approach.

Rodney Nissen (TheJiraGuy) characterizes Agile Poker for Jira by Appfire as a solution that facilitates collaborative estimation, even for teams that cannot be physically present. In this review, he highlights that the app goes further by offering a mode that allows teams to estimate even when they are not online simultaneously.