In the past, Knowledge Acquisition represented a barrier for developing intelligent systems, and particularly intelligent tutoring systems. In a recent work we proposed a model (Monaco-T ) for structuring and representing cooperative tasks. These tasks can be used directly in a cooperative learning environment, or in a simulation environment able to show how the cooperative task is effectively realized. To help experts representing knowledge with this model, we have built an editor able to produce tasks in Monaco-T format. The editor has graphic capabilities for editing rules, trees and layers, that are the basic elements of Monaco-T. Our editor also provides tools to directly link cooperative tasks to an external system able to react to direct manipulation. It represents an environment for component oriented programming.