Abstract: A resource staffing manager is provided that manages resource staffing of project teams. Requirements for one or more positions to be staffed for a project team and a budget for staffing the project team are received. For each position, eligible resources that meet the requirements of the position are selected. Based on a selected optimization method, optimal resource assignments for the project team are determined such that the optimal resource assignments include, for each position, a resource assignment of one of the corresponding eligible resources to the position. A GUI is displayed that includes the positions, the optimal resource assignments, and the eligible resources. Modified requirements for a position can be received, and, in response, the eligible resources are updated, updated optimal resource assignments are determined based on the updated eligible resources, and the GUI is updated to reflect the modified position requirements and display the updated optimal resource assignments.