The promise you make at intake is only good if the floor can meet it. The capacity calendar reserves the time when the order is taken.

Reserved When the Order Is Taken

Taking an order reserves capacity for the work it implies, so the next order is quoted against what is genuinely left.

See the Whole Calendar

A capacity calendar shows what is committed per day, including work that has not been dated yet, so you can move things before they become late.

Know When You Drift

Drift detection and reliability reporting show where promised dates and actual completion diverge, which is what tells you a rule needs changing.