Model 1: The Apology That Costs

To whom it may concern,

I am writing to acknowledge the oversight in our recent project delivery. The agreed deadline was October 5th, yet completion was delayed until October 12th. This deviation from our schedule was due to an underestimation of the resources required. While I take full responsibility for this miscalculation, steps have been taken to prevent recurrence. A revised resource allocation plan is now in place, ensuring future projects adhere to timelines. I understand the inconvenience caused and assure you of our commitment to improvement.

Sincerely, Sam