Excerpt from The Measurement of Teaching Efficiency
Efficiency in any work deals with details and particulars which are so numerous that standards and measures must be explicit and definite. To state that efficiency is the process by which to secure the maximum of result with the minimum of work and material is to stir up further inquiries as to what a good result is and how it may be attained. General directions and principles are here of little use for quiet effective action, and for products economically brought forth. On this account, any practical scheme for measuring the efficiency of teaching must be extremely detailed and specific.
In making five divisions for most of the merits there is no assumption on my part that any magic potency inheres in this number. It is simply convenient for purposes of classification, and sufficient for the detail necessary in distributing the constituent excellencies of any unit. Whatever unit or standard is taken can readily be divided into as many parts as one desires, whether the number be three, four, five six, etc.
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