Career certainty refers to the degree to which individuals feel confident, or decided, about their occupational plans. Since Parsons first classified people into career-decided and career-undecided groups, counseling researchers and practitioners have worked to formally assess career choice status. These efforts have yielded two generations of instruments useful for gauging clients' levels of and reasons for indecision as well as degrees of certainty about their career choices. First generation measures of career choice status yield total indecision scores. They have generated research on identifying multiple subtypes of undecided people and on developing differential interventions for each type. Second generation measures differ significantly from earlier instruments in that they were developed explicitly to assess multiple dimensions of career indecision. Counselors can use these scales to identify specific barriers that prevent a client from reaching a career-decided state. Surveying clients in terms of their choice status continues to help researchers understand the complexity of career indecision and choice status. It also aids practitioners in planning appropriate career counseling interventions. (JBJ)