TheStaircase Step #2 introduces Micro into your gameplay. The video (below) shows many scenarios where you can use Micro and Multitasking. One of the most simple examples is Proxy-Rax in in a Ladder-Game. Playing this strat will improve your Micro a great deal.

http://wiki.teamliquid.net/starcraft2/Micro

The next important part is "Play agressive!"

TheStaircase Guide

Quote: "Play aggressively; avoid static defenses. [NeoBlade: 1-2 Cannons is ok, if you have to defend Drop-Play, DTs and so on]"

When you play aggressive your Multitasking will improve and you will be able to scout the front more often.