Strategic benefits offered by well-executed investments in information technology (IT) have been acknowledged extensively. Among other factors, successful return on IT investments depends upon timely availability of quality of IT personnel. IT workforce planning necessitates active projections of a firm's workforce transformation from both known technology evolutions such as shifting among platforms, and personnel transition scenarios such as retirement, turnover, and other career decisions. Using a design science approach, we propose the development of a modular workforce planning system that captures current workforce inventory, projected personnel transitions, and projected skill evolutions to generate future workforce states. This proposed system has implications for development and design of systems for succession, transition, training, and hiring/exit decisions for an IT workforce environment.