Exactly what this guy said. I currently run WS4SB and I freakin' love it. Like he said, there's no such thing as linear progression on ANY West-Side template. It's all "spur of the moment" type training, if you will.
Let's say it's ME Upper Body day. If I start off with CGBP, here's what it looks like:
Bar - 2x10
95 lbs - 2x3
115 lbs - 1x5
135 lbs - 1x3
155 lbs - 1x3
175 lbs - 1x3
185 lbs - 1x3
On the last set, I should really struggle to get all 3 reps. That's why it's called a MAX EFFORT.
The next week, I'll try and beat my previous best, so I'll go for 190x3, or if I'm feeling ambitious, I might go for a single or a double. Hope this helps.