Hi, I had a bit of a newbie question that I can't seem to find the answer to on google. I understand what BA only, BA+15, BA+30, MA, MA+30, etc mean on salary schedules, but what I don't understand is what exactly is counted in those units. If I have a bachelors and my teaching credential, is that all counted under BA? Or do the units I've completed for the credential count as those '+' units? And if those credential units DO count as '+' units, then why is there even a 'BA only' column to begin with? I thought all teachers needed to have a credential? Thanks!