"Few professional men carry on their activities in seclusion comparable with that of the class room. There is frequently a tendency for the teacher, deprived of the stimulus that comes from suggestion and helpful criticism, not to show the expected professional growth. . . . A blanket statement such as is usually made'He is a good teacher' or 'He is a poor teacher'is worthless as a chart for improvement. . . . As contrasted with the casual appraisals now made, a respectable survey of a man's effectiveness as a teacher should be:...
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