or policies; rather, it is defined by the program office. However, since ID R and FDR are the Technology Development phase’s equivalent to Preliminary Design Review and Critical Design Review, this technical note proposes that they should have similar criteria, scaled for Technology Development work. This technical note presents definitions of IDR and FDR, their context in the acquisition life cycle, parison of engineering emphasis during IDR and FDR, IDR and FDR pre- and postconditions, and IDR and FD R criteria and how to apply it. The audiences for this technical note are managers and developers of medium to large DoD systems that employ technology that is not mature enough to tran sition directly to systems development. CMU/SEI-2006-TN-023 vii viii CMU/SEI-2006-TN-023