As you experience as editor, one of the most difficult steps during editorial process for journals is to find enough referees. In addition to the fact that intense referee requests can over occupy the researchers, the thought that it is better to devote the time reserved for refereeing to research and training may also play a role in this. What are the effective methods and approaches you use in assigning referees to the manuscript as editor? Furthermore, what are the criteria you take into account in requests for refereeing as referee?