Classifying tasks based on timeline of impact

This is simply the concept of categorising tasks based off the impact they would have within a certain time period. Some changes. For example:

A tasks

expected to yield significant benefits over a 5-year timer span and beyond; including tasks that might yield benefits over a shorter period of time but should be expected to have ongoing impact 5+ years from now.

B tasks

expected to yield benefits over a 2 year timespan or less. The general expectation is that the benefits will be fully realised within the first 2 years and there won’t be much additional benefit beyond that.

C tasks

expected to make a difference only in the timespan of 90 days or less. Most likely won’t even remember the task or see evidence of its benefits beyond that time. This includes routine actions like answering email, paying bills & returning phone calls.