Unpredicted Added Task

Story points are already estimated and you have already talked with your team regarding the tasks you should work on. Deadline is approaching and you think that you will make it in time with the pace you're going(working at least 50hrs/week). But a day before the deadline, you encounter a task that requires RnD and you have no idea how long this RnD will take you.

  • How will you communicate this with your team?
  • After the RnD, you found out it will take at least another day to finish the task. How will you say it to your team and your supervisor?
  • If you are a team leader, what would be your response to this kind of situation?
  • What do you think is the possible solution to make it to your deadline?