Interesting to see that current research is suggesting that multitasking is harmful to performance. There’s even an expert lecturer who has banned note taking in his lectures. It seems that a large chunk of the research is on people who are learning something new, rather than applying learned rules. This means that it may not be so relevant for work situations. That said, the illusion of competence appears to apply to learned activities. Given the ability to multitask on most computers (they are multi-modal multimedia devices) this is only going to get worse until the human brain catches up.