 There are a variety of philosophical questions that are raised by SCP. First, who are the stakeholders in determining the boundaries of the analysis, what are the relevant criteria to be used, and what is the focal biotic unit? Second, what is biodiversity and what are the biotic constituents we are trying to conserve and ensure persist? Given problems with current definitions of ‘biodiversity’ as we saw above, we must articulate what biodiversity constituents and surrogates are, along with other diversity and persistence concepts. Third, given resource scarcity, efficiency is one of the goals of SCP, and thus how do we solve the minimum area and maximum representation problems mentioned above? What is striking is how much the discipline includes over and above models like the Lande metapopulation and MacArthur and Wilson equilibrium models. As Sahotra Sarkar writes,