The evolution of vocational assessment and worker-trait-factor technologies is reviewed, as well as the conclusions to be drawn regarding vocational indices of import to vocational experts, from its origins to its current state, including the proliferation of software programs based on worker trait-factor methods. Organized historically and by topic, the article presents VDARE (Vocational Diagnosis and Assessment of Residual Employability) as the precursor model from which subsequent systems have emerged. Includes a rare history of the published research and landmark presentations contributing to the reawakening of worker-trait-factor methodology in light of innovations in computer technology. Concludes with a call for vocational experts to join in the research and refinement of an empirically valid worker-trait-factor methodology predictive of wage earning capacity and various measures of employment potential.