Santa Monica-based Cornerstone OnDemand revealed Tuesday that the firm has scored what it claims is the "largest global implementation" of software-as-a-service, with human resources firm Kelly Services. According to Cornerstone OnDemand, Kelly Services will use the firm's talent management software for nearly 659,000 employees worldwide. Financial impact of the deal was not disclosed. According to Cornerstone OnDemand, Kelly Services will use its software for managing both its temporary and full-time employees. Kelly is a staffing firm, managing around 650,000 temporary staffers.