While reviewing a sprint, the effort required to complete the balance tasks in the sprint showed 300 person hours, where as the balance available capacity of the team of 7 working for another 4 days (till the sprint completion date) at the rate of 7 hours per day equalled only 196. While this was an alarm bell for me, the scrum master and the rest of the team was very comfortable with it. Based on the experience gained within the current sprint, the team feels that the balance tasks will not take as much as the estimated figures. The estimates of those tasks which are already volunteered by someone already, got revised (balance effort) based on the learning within the sprint. Those tasks which are not yet volunteered did not get revised yet. The team feels that once they revise the balance effort required for the tasks which are not yet volunteered, the difference of 300-196=104 will reduce to a manageable level. While the team is busy completing their tasks, who will take the initiative to revise the balance effort of those tasks which are not yet volunteered. Here is the question of something needs to be done, and no one is volunteering to do it…and that is a great opportunity for the scrum master.