<P> (PSP3 is a legacy level that has been superseded by TSP .) </P> <P> One of the core aspects of the PSP is using historical data to analyze and improve process performance . PSP data collection is supported by four main elements: </P> <Ul> <Li> Scripts </Li> <Li> Measures </Li> <Li> Standards </Li> <Li> Forms </Li> </Ul> <P> The PSP scripts provide expert - level guidance to following the process steps and they provide a framework for applying the PSP measures . The PSP has four core measures: </P>

Personal and team process model in software engineering