The agreed-upon tasks, including measurable level of effort; what tools and materials are. Needed; and deliverables or acceptance criteria.This article will look at the five W's (Who, What, Where, When, and Why although slightly out of order) of the tender letter. If you have questions after reading the Instructions, please call 602-542-3026 or (within Arizona only) 800-345-5819. Your proposal acceptance letter can specify any discussions or meetings you wish to hold before completing paperwork. Be sure to use proper spelling and grammar at all times. As per your advertisement, given in the above mentioned website(s). 2. By mail: o Fill out the form letter at the end of these procedures. O Mail to the other party: â–« The completed form letter. TENDER ACCEPTANCE LETTER - Free download as PDF File (.