PGI 217.7404-1 Authorization.
(1) The requiring activity, in coordination with the contracting office, will prepare the request for approval package for an undefinitized contract action (UCA) requirement. The approval package shall—
(i) Document why a UCA is required (for letter contracts see DFARS 216.603);
(ii) Provide a detailed explanation for the need to begin performance before definitization;
(iii) Address the adverse impact on agency requirements that would result from delays in beginning performance;
(iv) Identify the risk of using a UCA and the means by which the Government will mitigate such risk;
(v) Identify and justify the specific contractual instrument to be used;
(vi) Establish limitations on the obligation of funds; and
(vii) Provide the definitization schedule of agreed-upon events that support timely definitization.
(2) A sample format with certain variations for letter contracts is provided at this website: http://www.acq.osd.mil/dpap/dars/pgi/docs/Template_for_UCA_Authorization_Requests.pdf.