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Similarly , Percy Williams Bridgman is credited with the methodological position known as operationalism , which asserts that all observations are not only influenced , but necessarily defined , by the means and assumptions used to measure them .
 Percy Williams Bridgman
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Percy Williams Bridgman