In scientific literature, an acknowledgement is an expression of gratitude for assistance in creating a literary work. It is written on a separate page at the beginning of the paper. It comes after the dedication but before the introduction. It must not be too long; in fact, one page should be enough. Receiving credit of acknowledgment rather than authorship indicates that the person or organization did not have a direct hand in producing the work in question, but may have contributed funding, criticism, or encouragement to the author.