A planning methodology where the work is scheduled and assigned to a single person. 1:1 (one-to-one) planning means that the order can only ever have one active work assignment at a time. It is possible in this scenario for an order to have more than one work assignment during its lifecycle, but never more than a single active one at the same time. This implies a direct dependency between the job and the assigned resource (internal tradesperson).

With one-to-one planning, one work assignment is created for the order. The key data between the two is continuously kept in sync. You can still edit the data on the order, which is not possible in 1-to-n planning.