The increasing tendency across scientific disciplines to write multi authored papers [1,2] makes the issue of the sequence of contributors’ names a major topic both in terms of reflecting actual contributions and in a posteriori assessments by evaluation committees. The reviewers aware that there are different cultures to authorship order. The usual and informal practice of giving the whole credit (impact factor) to each author of a multi authored paper is not adequate and over emphasizes the minor contributions of many authors. Similarly, evaluation of authors according to citation frequencies means often overrating resulting from high-impact but multi authored publications. Teja Tscharntke et al. [72] proposed that four methods. Like as SDC,EC, FLAE, and PCI. Comparison of the credit for contributions to this study under the four different models has been suggested. The proposed systems, such as Individual Frequency (IF) and Weighted Frequency (WF), have no repeated impact for each position.