Velocity can be a very useful predictor of how much work an Agile team can compete in the future. In general, the impact can be ignored with the idea that history repeats itself and that team members will probably take time off in the future at the same rate they took time off in the past and reduced productivity balances off over a long term. However some situations demand adjustment for holidays and team member vacations, like in a situation when a project is of short duration, a team member is on leave for more than a normal period, etc. In such cases, velocity is adjusted proportionately to the full team, with an understanding that everyone can do everything. So, Predicted Velocity = Average Velocity × (Planned Working Days ÷ Average Working Days). But in case if team members are not interchangeable, velocity is adjusted proportionately based on skills.