jean piaget jean piaget (1896 - 1980) was employed at the binet institute in the 1920s, where his job was to develop french versions of questions on english intelligence tests. Conservation refers to a logical thinking ability which, according to the psychologist jean piaget, is not present in children during the preoperational stage of their development at ages 2–7, but develops in the concrete operational stage at ages 7–11. Essays - largest database of quality sample essays and research papers on piaget child observation report. Jean piaget (1952 see also wadsworth piaget’s methods (observation and clinical interviews) are more open to biased interpretation than other methods.
1 piaget’s theory •the first “cognitive” theory, developed by jean piaget beginning about 1920 •piaget observed and described children at.
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Jean piaget (french: piaget developed a combination of naturalistic observation with clinical interviewing in his book judgment and reasoning in the child.