The MetLife Mature Market Institute has developed a workbook to help individuals who are trying to figure out when to retire, and how.

The workbook provides assessment tools, along with discussions of topics such as “trigger events” and methods for estimating how much income individuals will need once they are retired, according to the MetLife Mature Market Institute, Westport, Conn., an affiliate of MetLife Inc., New York.

A Web version of the workbook is available on the institute website, at http://www.maturemarketinstitute.com