Most Scrum teams add additional events to their Scrum workflow. A good example is called backlog refinement, an event which some teams hold as regularly as once per week, or at least once per Sprint.
The backlog refinement meeting aims to look at the top stories on the backlog and prepare them to be worked on in an upcoming Sprint. Part of this preparation will include estimating the User Stories, which will tell us whether:
- We have enough information to able to start working on the User Story
- We've broken the story down into a small enough chunk; a User Story must be small enough to be completed in one Sprint
Estimates are usually given in Story Points; we'll talk more about those in the following two chapters.