Thermodynamic phase space patterns of solid-liquid-vapor (slg) behavior in binary systems are reviewed. The van der Waals equation of state is used in combination with a common mathematical artifice for the solid-phase fugacity function to map out the sig loci for a model binary homologous series of solvent + solute mixtures as a function of the solute characterization. The computational results suggest the possible existence of a richer thermodynamic phase space topography than previously envisioned.