Two examples of stellar predictions from models of asymptotic giant branch (AGB) stars are presented to illustrate the difficulties associated with astronuclear studies. The first example is the dredge-up process by which nuclei synthesized in the stellar interior are brought to the surface; the second is the production of primary sodium. Those examples illustrate the need for a good understanding of the details of model calculations from both a physical and a numerical stand point. They highlight as well some of the current limitations of AGB model predictions.