Simple Tracked Vehicle Build Instructions for Lego Mindstorms EV3 Education Core Set 

This video contains instructions for building a simple tracked vehicle. It requires only a Lego Mindstorms EV3 Education Core Set.
The instructions use the sprockets and treads from the education version of Mindstorms, but I think it can be easily adapted to the home version by replacing the sprockets and treads with the wheels and treads from the home version.
A pdf version of these instructions is available in the Files section of the Facebook "LEGO MINDSTORMS EV3" public group. The file name is:
simple_tracked_vehicle_instructions.pdf