A discipline focusing on the management of activities within business processes as the route to continuously improve both the value received by customers and the profit earned in providing that value. AMB uses activity-based cost information and performance measurements to influence management action.
See Activity-Based Costing.
Activity-Based Planning (ABP): Activity-based planning (ABP) is an ongoing process to determine activity and resource requirements (both financial and operational) based on the ongoing demand of products or services by specific customer needs. Resource requirements are compared to resources available and capacity issues are identified and managed. Activity-based budgeting (ABB) is based on the outputs of activity-based planning.

This definition is in context to Supply Chain. See more contextual defintions for Activity-Based Management (ABM).