Scrum
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Arguably the most structured framework of the Agile methods, Scrum was first introduced in the 1986 as a way for "teams to work as a unit to reach a common goal," according to its inventors Hirotaka Takeuchi and Ikujiro Nonaka. Scrum takes parts of Traditional and Agile project management ideas, and combines them for a structured yet flexible way to manage projects. Like Agile, Scrum breaks projects up into tasks that are completable on their own, and then assigns each a "sprint"—two to four-week slots of time dedicated to ship that phase of the project, with daily sprints to ship some part of that phase. It’s that focus on time that makes Scrum a bit more like TPM, bringing more structure to the Agile idea.

Release
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The filter bar makes it easy to switch between releases and/or iterations, be it the previous, current or next one.

A project can support multiple releases.

Iteration
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A release may consist of multiple iterations.

Release Kickoff
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The Release Kickoff pages allow you to perform a release kickoff for the currently selected project and release.

Retrospective
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The Retrospective pages allow you to perform a retrospective for the currently selected project, release and iteration.