Summary: The paper presents the MILL ‒ a system which supports planning of training measures. Its background technique, task-competency modeling, is based on formal concept analysis as an indirect and qualitative way of determining the abilities of learners. In that context, the fulfillment or failure of a work task is the indicator of a set of necessary competencies. The core of the presented approach is a matrix structure ‒ a formal context ‒ which has tasks as labels for its rows and competencies labeling its columns. This matrix is the basis for defining formal concepts which can be ordered in a lattice for navigation and systematic decision support on training measures in an organisation.