Draft a mutual action plan with your buyer

I'm working on a deal with [COMPANY]. Here's what I know:
- Their goal: [GOAL]
- Date they need it by, and why: [DATE + REASON, OR "unknown"]
- People involved: [NAMES AND ROLES]
- Their buying process: [WHAT YOU KNOW, OR "unknown"]

List the things I still need to find out before I can build a realistic plan to signature and go-live, e.g. security review, legal, procurement, budget approval or other decision makers. Put them in order of risk.

Build a mutual action plan working backwards from [GO-LIVE DATE].
Include these steps where relevant: business case approval, technical or security review, legal review, procurement, signature, kickoff, onboarding and go-live.
For each step give: milestone, owner (their side or ours), target date, and what has to be ready.
Leave realistic time for their internal reviews, using these timings if known: [KNOWN TIMINGS, OR "use typical ones and mark them as estimates"].
Output it as a table.

Write a short email to [NAME] sharing a draft plan to get to [THEIR GOAL] by [DATE].
Ask them to correct anything that's wrong, especially owners and dates on their side, and whether anyone else needs to be involved.
Under 100 words, friendly, no pressure, no "just checking in".