A project decision log: who decided what, and when
https://archon-partners.com/guides/project-decision-log/

From Archon & Partners. Replace everything in [square brackets] and read each template before you use it.

=== Confirm a decision in writing ===
When: Same day as the decision
Subject: [Project name]: confirming decision [D-number]

Hi [Client first name],

To confirm what we agreed on [date]:

Decision: [decision in one sentence]
Options considered: [options]
Effect on fee or schedule: [none / describe; additional services need your written approval before we start them]

If this is not what you understood, reply by [date] and we will correct it before we act on it.

Best,
[Your name]

=== Log columns ===
When: Paste as the first row of a new sheet

Number	Date	Decision	Decided by	Options considered	Fee/schedule effect	Replaces	Link