Patent ID: 7259097

Claim:
A control system for controlling an apparatus to perform a multi-layer chemical mechanical polishing (CMP) process with a polishing rate for a plurality of process runs, wherein for each process run, a multilayered structure with a first thickness formed on a wafer is polished and a second thickness of the multilayered structure is predetermined to be polished away, the control system comprising: a receiver for receiving a post-CMP thickness of the multilayered structure of a first process run, wherein for the first process run, the CMP process is performed for a first CMP process time; an operation unit for determining a second CMP process time according to the first CMP process time, the first thickness and the post-CMP thickness; and a providing unit for providing the second CMP process time to the apparatus for processing a second process run posterior to the first process run, wherein the second CMP process time is determined according to: Time second = TK tg × Time first TK org - TK post , wherein Time second denotes the second CMP process time, TK tg denotes the second thickness, Time first denotes the first CMP process time, TK org denotes the first thickness and TK post denotes the post-CMP thickness.