POM2 is based on the well-accepted Boehm and Turner model  \cite{btBoehm} 
for comparing plan-driven and agile methods. In  \cite{btBoehm}, plan-based 
and agile methods are considered to have their ``home-ground'' at opposite 
extremes with respect to five project factors, Criticality, Dynamism, 
Personnel, Culture and Size. According to \cite{pom1}, the theory states that most projects will 
have some low factors, some high, and some in between and rarely wholly 
within either method's home ground. Thus using a mixture of approaches 
to best match the factor values is generally more effective for any given 
project. 

