The first activity requested by donors, usually in the first weeks of project implementation, is preparation of Project procurement plan (PPP). This document is not only necessary for selection of tender procedures but it defines dynamics of project activities and should be aligned with timeline of project actions. Good project management use this as a tool for prediction of cash flow during project implementation. For EU financed project PRAG defines types of procedures as well as thresholds for selection of appropriate procedure. For some programs like Interreg-IPA CBC there are additional rules usually collected and published in Project Implementation Manual (PIM).
Procurement procedures are precisely defined in PRAG for EU financed actions.