A computer comprising a recordable medium on which is stored instructions for at least one model-based, run-to-run controller routine is provided. The computer includes instructions to receive a first dataset regarding a first wafer after a first process, to determine a process parameter for the first process for a second wafer using the first dataset; and to determine a second process parameter for a second process for the first wafer using the first dataset. In an embodiment, the first process is an etch process. In an embodiment, the second process is a planarization process.