A manager is responsible for the details of an object (block, metric, risk,…). This means they can change the titles, description, and so on. The owner of an object is responsible for doing the day-to-day updates. In terms of the blocks structure, the owner of a parent block is automatically the manager of the child blocks. This is because the owner is responsible for updating a block’s progress, and for non-leaf blocks the progress is determined by the children. With metrics, the owner is responsible for updating the actuals, and the manager is responsible for the targets (as well as all the other properties).