WCA highly recommends the use of Cube Comps before and during a competition. Cube Comps is an online system with live scoring and many interesting features, like scorecard printing and a very efficient multi-user data entry system. Created by Luis J. Iáñez and now under Open Source.
Score sheets and scrambles should be processed and checked for errors using the WCA Workbook Assistant before sending them to the WCA Results Team.
The latest version of the WCA competition Score sheet can be downloaded here:
WCA competition Score sheet.