Although compliance with medications is often conceptualized as an all-or-nothing phenomenon, it is more realistic to think of compliance across a continuum of "partial compliance" behaviors. Commonly, a patient will take some—but not all—of his or her prescribed medication. Peter J. Weiden, M.D., and his coauthors assessed the partial compliance behaviors of 4,325 California Medicaid patients with schizophrenia and then estimated relationships between these behaviors and the patients' risk of hospitalization. Although the overall finding of the study is not surprising—an association between poorer compliance and hospitalization—results for individual partial compliance behaviors cast light on the undeniable risks associated with seemingly minor lapses in compliance, such as a medication gap as small as one to ten days (see page 886). In a related Taking Issue piece, Samuel J. Keith, M.D., discusses why such brief lapses can have serious consequences (see page 857).