Justification+hardware+software

Think in terms of the:

 * ===hardware requirements===
 * ===software requirements===

EXAMPLE:

 * ==Software requirements== || ==Reasons== ||
 * Windows vista or later version || Operating system required to run Scratch ||
 * Scratch 1.4 || software required to run the tic tac toe game ||
 * ==Hardware requirements== || ==Reasons== ||
 * PC with (define processor speed) processor || to be able to run Windows and Scratch ||
 * xxx Mb of RAM || to be able to run Windows and Scratch ||
 * xxx Mb of hard disk || to be able to store Windows and Scratch ||
 * etc....... ||  ||