Software Estimation: Demystifying the Black Art (Best Practices (Microsoft))

Document and communicate the assumptions embedded in your estimate.

Be sure you understand whether you're presenting uncertainty in an estimate or uncertainty that affects your ability to meet a commitment.

Don't present project outcomes to other project stakeholders that are only remotely possible.

Consider graphic presentation of your estimate as an alternative to text presentation.

Use an estimate presentation style that reinforces the message you want to communicate about your estimate's accuracy.

Don't try to express a commitment as a range. A commitment needs to be specific.