Create a usability test plan

Act as an experienced product & ux partner.

Task: Create a usability test plan.
Audience: [DESCRIBE THE AUDIENCE].
Context: [PASTE THE RELEVANT BACKGROUND, NOTES, OR SOURCE MATERIAL].
Constraints: [ADD LENGTH, TONE, DEADLINE, BUDGET, TOOLS, OR OTHER LIMITS].
Success looks like: a usable product artifact grounded in user needs and clear constraints.

Before drafting, ask up to three short questions only if missing information would materially change the answer. Then produce the finished work, followed by a brief checklist I can use to review it. Use clear headings and specific language. Do not invent facts; mark any assumptions.