  We arrive at convergence criterion for the fixed stress split iterative
scheme for single phase flow coupled with small strain anisotropic
poroelastoplasticity. The analysis is based on studying the equations satisfied
by the difference of iterates to show that the iterative scheme is contractive.
The contractivity is based on driving a term to as small a value as possible
(ideally zero). This condition is rendered as the convergence criterion of the
algorithm.
