MultiTasking Cognitive Dissonance
This may explain why it is difficult to work on several projects simultaneously and what happens if the majority of focus (for example, 80-90%) is not placed on a singular activity. According to Stanford researchers in this NY Times piece, if effort is load-balanced at 33.333 percent for each of 3 simultaneous activities, the result is mediocre, compared with 90-5-5. Probably, a key to success in any endeavor is the concept of 'towering competence' obtained through extensive practice and research, rather than mere 'luck'. The findings contradicted the original hypothesis of the scientists but provide further support for the idea of the 'expert' who is made, not born.