A number of reasons commonly given for lecturing and claims commonly made for the efficiency of lecturers are examined for their basis in empirical evidence and common sense. Most of these claims are found to be somewhat weak. It appears that lecturing takes place rather more often than can be reasonably justified. The real reasons for the popularity of lecturing amongst lecturers are then examined. Of the twenty reasons for lecturing examined here, the first nine have little substance and the last eleven are avoidable.