The final phase in the research process is the publication of research findings in a paper in scientific journals. Authors who contributed to the developed work are reported in the manuscript. There are now rules and guidelines to help in improving the transparency for the reporting of authorship and contributorship in papers which are discussed in this chapter The appraisal of the quality of scientific and medical can be difficult. Criteria that had been used in the past included journal prestige, the reputation of authors and institution and prestige and estimated importance and relevance of the research field. However, these factors are both qualitative and subjective. Consequently, there is demand for quatitative and objective indicators for evaluating research that is related to published science. The impact factor is perhaps the most widely used indicator that measures and quantifies a journal’s quality.