Interest inventories and career assessments continue to be used to support practitioners as they work to uncover client interests, abilities, skills, motivations, values, and other personal factors that help individuals self-define and construct their career. The skilled use of career inventories and assessments remains a minimum competency of career service providers' ability to successfully partner with their clients. A history of the evolution of assessment from 1914 through 1974 and considerations for the future of assessment are highlighted to provide historical perspective to inform practitioners as they serve the diverse needs of complex client populations.