Both intimate partner violence (IPV) and stalking offenses share common elements with criminal behavior in general. However, there are unique elements that require further empirical and clinical investigation. There are six key points presented in this chapter to guide assessment and treatment: (1) clinicians should resist simplistic explanations of IPV and stalking; (2) IPV is perpetrated by men and women and is frequently mutual in nature; (3) IPV perpetrators and stalkers share many of the same risk factors and psychopathological problems that other offenders have; (4) the literature on IPV and stalking suggests that a range of treatment needs are likely to be present; (5) individualized assessment of a wide range of potential risk factors is required to match client need with treatment targets; and (6) client variables such as psychopathology are important when designing and delivering treatment, and that treatment should be responsive to the individual needs. Tables and references