This study investigated the interplay between perceived investment in contract worker development by the "client" organization and contract workers' perceived organizational support from their temporary employment "agency." A study among 2021 contract workers from three temporary employment agencies in Norway showed that the relationships between perceived investment in contract worker development and task and contextual performance were moderated by contract workers' perceived organizational support from the agency. The form of the moderations revealed no positive relationships between perceived investment in contract worker development and performance unless the perceived investment by the client organization was accompanied by higher levels of perceived support from the temporary employment agency. These findings suggest that client organizations, which hire from temporary employment agencies that provide support to their contract workers, will get the most out of their investments in these contract workers' development. (Contains 3 figures and 2 tables.)