Common indicates variance predicted by two or more items. The median time for the introductory tutorial was 9 minutes compared with a nominal time of 15 minutes. For the remaining tutorials which had a nominal completion time of 50 minutes, the median values of the actual times ranged from 33 to 65 minutes. Time spent using the computer tutorials. When courses are modified or new methods introduced there is an opportunity to assess the value of the change.
Courses change continually.
New pedagogical tools are offered to the teacher by sales representatives with the same enthusiasm, if not the same frequency or inducements, as new therapies are offered to physicians. Often change is minor or subtle and evaluation is informal and based on the subjective judgement of the agent for change. At other times formal evaluation is omitted simply because staff are too involved in implementation to find time for evaluation. In our study computer based learning tutorials were generally perceived by the students as better than lectures, laboratory classes or the video session in all categories except the level of detail. Other attempts to determine users' perceptions of computer based learning have returned varying results.