text: Someone could want to try more than one piece of advice at one time. Trying more than one piece of advice at one time could be effective because all pieces of advice that you are taking could all be similar in some way. Using the same volleyball example, someone might say "you need a faster arm swing" and the other "you need to toss the ball higher". These are both giving that person advice on technique. If you use both, you will be happier with the results. Using more than one piece of advice is effective because both could work in the same situation.