This chapter defines the basic tests that are used to verify the material options in the ABAQUS library and documents the results of the tests. The ABAQUS results are compared with exact analytical solutions when they are available; otherwise, they are compared with other approximate solutions. Mechanical properties and thermal properties are tested in this chapter. For each mechanical material model listed, options and dependencies are exercised in stress/strain paths that are relevant to the particular material model. The material verification tests are also performed in all the different stress spaces available for each particular material model by choosing suitable finite elements.