Abstract: Provide some perspective on characteristics or features which drive the cost of the EDL Instrumentation. Using MEDLI, MEDLI2, EFT1, and Ares I-X as case studies. Need to consider what program is funding the effort and how that program likes to manage projects. Need to define the limits of the measurement subsystem – what is being provided and implemented – and by whom. The yearly end of fiscal year drama will always introduce uncertainty which will impact the cost – and cost phasing.