First, and most importantly, I would like to thank Anab0ic for his concern, sorrow and pity for us ignorant folks who have used the 5X5 system. Thank you again, your worship.
Agree with Yev33's good information, many different versions of 5X5's, with the Bill Star idea probably being the core of this method now days. Usually 3 to 4 exercises for this full body type workout. If you want to throw in the little exercises, like curls, then that is you business, but 5 exercises should be the max. 5X5's will put on muscle mass, though like any thing else in BB'ing (or life) not any one thing works for everybody the same. 5X5's works very well for athletes, most notable football & Rugby players.
I call this type workout Square Root training. Included, and most used, are 6X6, 8X8 & 10X10's (AKA German Volume Training). Don't know why, but each seems to work very well at given times in weight training. Most of these systems are based on using the same weight throughout the workout. If thinking this is sissy stuff with using the same light weight to start, try 10 sets of ten rep, with a 90-120 seconds rest between sets, with the squat or even bench. Some of my best upper body results have been when dong the bent arm pullover & press (BB or DB's). Also BB cleans, in a PR. Used these in the basic 5X5's, with good results, also. Good Luck.
