Errors resulting in interpretation of curves if the zero of the vertical scale is not shown on the chart. The selection of scales for curve plotting. Different impressions from curves from the same data but with various scales. Optical illusions which may afl^ect graphic work. A checking list for final inspection of graphic presentations. Need for standard rules of grammar for the graphic language. A few suggested rules for graphic presentation. Great advantages may result if graphic methods are more widely used for portraying quantitive facts.

GRAPHIC METHODS

PRESENTING FACTS

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GRAPHIC METHODS FOR PRESENTING FACTS

Chapter I COMPONENT PARTS

AFTER a person has collected data and studied a proposition with great care so that his own mind is made up as to the best solution for the problem, he is apt to feel that his work is about completed. Usually, however, when his own mind is made up, his task is only half done. The larger and more difficult part of the work is to convince the minds of others that the proposed solution is the best one -- that all the recommendations are really necessary. Time after time it happens that some ignorant or presumptuous member of a committee or a board of directors will upset the carefully -thoughtout plan of a man who knows the facts, simply because the man with the facts cannot present his facts readily enough to overcome the opposition. It is often with impotent exasperation that a person having the knowledge sees some fallacious conclusion accepted, or some wrong policy adopted, just because known facts cannot be marshalled and presented in such manner as to be effective.