Suppose you're playing on the G string and is about to do a descending pattern/scale/anything, You're about to change strings, from the G string to the D string. The final note on the G string is played with your index finger. Do you play the next note on the D string with your index finger that played the last note, to economize a move, or alternate your fingers no matter what? My teacher said that it's a such basic mistake, and everybody - even most pro players - do it and don't alternate you fingers on pizzicato all the time. I have noticed it also. I spent some time working on it and now I always alternate my fingers, after years making that mistake. Do you think it's the right way to play or you just don't mind not to alternate your fingering when jumping from a higher string to a lower string?