To do this we focus on determining simple metrics (aggregation number, micelle shape, micelle branching, etc) relating to the aggregation behavior of surfactant systems. Our rationale for this is that whilst rheological behavior of surfactant systems is complex, depending upon numerous factors include micellar structure and scission and recombination rates, it is known that in order to build good levels of zero shear viscosity, large aggregates (preferably worm-like) are required as a prerequisite.