The Ways of Mattering questionnaire (N. E. Amundson, 1993, 2003) was developed to evaluate clients' perceptions of a counseling relationship. This study reports the construct and convergent validities of the Ways of Mattering as well as the internal consistency of each of its subscales for people with mental illness who were registered in supported employment programs. The questionnaire demonstrated satisfactory validity and reliability with this population. The instrument could be useful for identifying the basic and positive elements required to establish a solid foundation for developing a working alliance between the counselor and the client. (Contains 2 tables.)