“…The rationale for using evidence A notable link can be drawn between the use of evidence in the growing interest in value studies (Chivers and Thebridge, 2000), those studies demonstrating impact (Brettle, 2014), and more specifically, in measuring return on investment (Tenopir, 2013). For some librarians, evidence is sought as increasing attention is devoted to developing a culture of assessment, both in the library sector (Greenwood and Cleeve, 2008;Mackenzie, 2009). For others, evidence is sought and integrated into the work practitioners perform when they feel they will be put in position where convince and influencing may be necessary (Koufigiannikis, 2013).…”