This article discusses key concepts in the counseling and assessment literature that can guide sound career assessment with lesbian, gay, and bisexual individuals. Sexual identity development and environmental factors are discussed as variables central to career assessment. In addition, a number of potential sources of assessment bias are identified in the design, selection, and use of career assessment tools.Following nearly a century of silence throughout the history of vocational psychology, the study of the career issues relating to lesbians, gay men, and bisexuals has developed recently into a legitimate scholarly focus within the career literature. More than 40 articles relating to the career behavior of lesbians, gay men, and bisexuals as a nonethnic minority group have been published in the professional literature-over 75% of these within the past 5 years alone. The literature has focused primarily on providing career counselors with suggestions for practice and intervention with lesbian and gay clients (Pope, 1995) but also includes several empirical investigations and theoretical efforts directed toward expanding our models of career behavior (Croteau & Bieschke, 1996). Rarely, however, have writers specifically addressed the issue of career assessment; any attempt to organize and apply the body of career counseling work systematically to the career assessment of lesbians, gay men, or bisexual individuals is noticeably lacking.This article provides a first step toward correcting that lack. Through a review of existing literature, both empirical and theoretical, this article discusses some of the central concepts that bear directly and indirectly on assessing the career concerns and situations of lesbian, gay, and bisexual clients. The term assessment is defined broadly, to include interview, testing, and other methods of assessment that are used to evaluate an individual's career situation or concerns.