The increasing importance and consideration of new product development and the attention of companies to explore the nature of new product development has created a strong body of researches in this area of management knowledge. The complexity of this new concept of product development and its interdisciplinary nature, has led researchers to use different approaches and consequently find different results. Thus, the literature of new product development can be divided into four categories ,namely, the context of main researches of new product development, differentiating factors in researches in new product development, identifying major themes in new product development researches and the studies of specialists in new product development researches. This paper examines each category in detail and finally builds the body and map of new product development literature.
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