A Checklist of steps to take when computing time periods under Massachusetts Rule of Civil Procedure 6 and the Massachusetts Rules of Electronic Filing. The steps include identifying the triggering event, determining whether the deadline is forward-counting or backward-counting, and applying the appropriate counting method for the time period. This Checklist also explains how to calculate service-based extensions and automatic extensions for Saturdays, Sundays, or legal holidays and electronically filed (e-filed) notices and documents.