Redistricting can be carried out using manual techniques - colour markers, paper maps, and calculators - or using sophisticated computers and GIS software. The technology employed does not change the task of the redistricters but it does change how the process is conducted and expands the information and options available to decision-makers when a final redistricting plan must be chosen. If GIS is to be used for drawing district lines, the first change in the process is the need to compile an electronic database.