Each team member will make unique and sometimes overlapping contributions. In this chapter we focus on psychologists who contribute their knowledge of aging and adult development to clinical issues. This knowledge will be especially useful in the differentiation of normal from pathological changes associated with aging. Further, geropsychological acumen is useful in clarifying which clinical problems may be reversible such as those caused by other treatments or medications. Psychologists can conduct cognitive, capacity, diagnostic, and personality assessments. Psychologists can assess other problems seen in older adults such as mood or anxiety disorders, suicide, and psychotic symptoms. As part of the team, psychologists should be proficient in adapting assessment methods and interventions to fit the setting. It is most useful if psychologists are familiar with a variety of intervention approaches and are knowledgeable about the most successful treatments of both physical and mental disorders. As members of an integrated health care team, psychologists are encouraged to offer consultation to family members, significant other close relations, and to other professionals. And, finally, psychologists should be sensitive to individual and community characteristics, and whenever possible apply up-to-date research findings and evaluation techniques to the problems at hand.