Outside the UOR process (as set out in Section 7.6) time is clearly perceived to be the least important factor of the Performance Cost Time envelope. This consideration has been reflected qualitatively through the Review's programme of interviews but also in the rate of overrun in time (c.80%) vs. cost (c.40%). This is a rational reaction for two reasons; the fact that most equipments under development as part of the ordinary EPP are not required "in anger" immediately on planned delivery into service (otherwise they would likely become a UOR) and the perceived costs of slippage in time are relatively small, confined for most projects to the increased estimates for cost of capital, reflected in IRDEL (which is widely considered the lowest priority DEL). As described in Section 7.7, the full cost of delay is actually substantially greater than may be immediately realised by IPTs.
Since time is under-valued, trade-offs between time and cost or time and performance are almost never made in order to accelerate the deployment of a capability. This is because any such benefit is outweighed by "apparent" penalties in the form of cost and performance.