This study reports the results of a preliminary study to develop a measure of employability for use in vocational rehabilitation settings. The instrument was piloted on 20 volunteer jobseeker participants then modified and trialled with a further 73 jobseeker participants. The partial credit Rasch model was applied to determine if the items formed a unidimensional construct. A 22-item Job Seeker Assessment of Employability scale resulted. The data support a developmental model of vocational rehabilitation that depicts jobseeker employability on a continuum.