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Schizophrenics tend to exhibit deviant behavior in a number of dif-ferent areas. This paper attempts to account for schizophrenic associ-ation and conceptualization disturbances, delusions, hallucinations, and regression in terms of a common process involving partial random-ization of response hierarchies. Because of a common underlying process, these different areas of schizophrenic behavior are expected to have similarities in terms of how they differ from normal behavior, and conditions under which behavioral deficit will be observed. A formal account which involves the facilitating effects of increased arousal on competing responses, when appropriate responses are at response-strength ceiling, is used to discuss similarities which are ex-pected across content areas. The implications from the account appear to integrate research findings and clinical observations concerning the different kinds of schizophrenic abnormalities discussed. This paper is concerned with the question, "Why do different behaviors which are thought of as 'schizophrenic' go together? " Our purpose is to pre-sent a possible explanation for the clus-tering of some schizophrenic behaviors, basing the explanation on a process which is seen as underlying different areas of schizophrenic behavior. The discussion is not intended as a defini-tive account of all behaviors which oc-cur in persons diagnosed as schizo-phrenic, partly because much of what will be said requires additional support, and partly because our goal is to em-1 Part of this paper was written while the senior author was a special consultant on