wirefire21 saidI always tell my clients this - Work opposite muscles!
Each day you do two groups. Chest/Back, Biceps/Triceps, Shoulders/Lats, etc etc
That way if you happen to miss a day for whatever reason, or if you don't "hit it hard enough", then you won't have the problem of strength differences and uneven growth as is the case with one who follows the old "chest/biceps, or shoulders/back" model.
Do you see any issue with working chest/back one day and then the very next day working biceps/triceps? Or is this schedule assuming a day off between weight training sessions?
I worked out years ago with a trainer that addressed potential over training by using what he called a major/minor technique. For example, we would hit the back really hard using a number of different exercises and fairly heavy weights with low to moderate reps. Then we would finish off with one or maybe two chest exercises with light weights and high reps using drop sets - basically keep going after muscular failure by lowering the weight and immediately pumping out another set.
My trainer didn't like to use the major/minor routine for more than two weeks at a time though because he was concerned about over training.