![]() In this case the subject was one very familiar to the test subjects, yet only 3.8% obtained the correct count. This experiment revealed a basic problem with manual ratings. Results were not Gaussian, however, as only 4.3% had higher values while 92% had lower values, some much lower. The correct answer was obtained by only 3.8% of the people. About 400 people were asked to count the number of times the letter āeā appeared in a paragraph without striking out the letters as they counted. ![]() Many years ago, George Moore (1) and members of ASTM Committee E-4 on Metallography conducted a simple counting experiment. Further, while humans are quite good with pattern recognition, as in the identification of complex structures, they are less satisfactory for repetitive counting. Although the fundamental relationships for stereology, the foundation of quantitative metallography, have been known for some time, implementation of these concepts has been restricted when performed manually due to the tremendous effort required.
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