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This research considers three general objectives. ) Identifying income smoother companies. ) Study of relationship between income smoothing and type of industry (corel or peripheral) and size of company (sale). ) Study of relationship between artificial income smoothing and size of companies (total sale) and type of industry (corel or peripheral). We have used two categories of information for studying the above-mentioned objectives. The first , our library studies , and the second are as secondary information in the form of derivated financial information from financial statements of accepted companies in Tehran’s stock exchange for - .