People are better at estimating relative size than the time needed for a task.

People are notoriously bad at estimating the time something will take, but are more capable of contrasting the sizes of two tasks. Using a smaller task as the basis for sizing others can help improve estimation.rS3

  1. Jeff Sutherland, Scrum: The Art of Doing Twice the Work in Half the Time, First Edition (New York: Crown Business, 2014). (See notes.)