These models are "metaphorical". That is they are one not dependent on a specific situation, nor a domain being modelled. Instead they are generic, giving transferable insight across a wide range of real-world situations. The models that describe limits to church growth are not calibrated for particular congregations, and could be applied to growth barriers in other social organisations, businesses, populations or the environment.
Interventions for relaxing limits to growth are general principles rather than specific policies that could be carried out. They are meant to challenge and inspire people to remove barriers to growth in their churches.