A method of operating a touch-sensing surface may include determining a first plurality of contact locations including a first contact location, determining a second plurality of contact locations including a second contact location, performing a first correlation process for correlating the second contact location with the first contact location when the number of contacts is less than or equal to a first threshold number, and performing a second correlation process for correlating the second contact location with the first contact location when the number of contacts is greater than a second threshold number.