Delays in delivery of new capabilities also means extension of support to older, less reliable equipment, or sometimes extended "double running" periods during the transition. The NAO MPR captures incremental costs of support from delays in bringing new projects on stream, although only in relation to the largest projects. It is likely the effect of delay in the EPP has a systematic and negative impact on support costs, although this is difficult to quantify. This is considered in more detail in Chapter 7.