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Screen mockups (also called user-interface sketches or user interface-mockups) have been proposed as a complement to use cases for improving the comprehension of functional requirements. In this article, we aim at quantifying the benefits achievable by augmenting use cases with screen mockups in the comprehension of functional requirements with respect to effectiveness, effort, and efficiency. For this purpose, we conducted a family of four controlled experiments, involving 139 participants having different profiles. The experiments involved comprehension tasks performed on the requirements documents of two desktop applications. Independently from the participants' profile, we found a statistically significant large effect of the presence of screen mockups on both comprehension effectiveness and comprehension task efficiency. No significant effect was observed on the effort to complete tasks. The main pragmatic lesson is that the screen mockups addition to use cases is able to almost double the efficiency of comprehension tasks.<\/jats:p>","DOI":"10.1145\/2629457","type":"journal-article","created":{"date-parts":[[2014,10,14]],"date-time":"2014-10-14T12:29:11Z","timestamp":1413289751000},"page":"1-38","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":30,"title":["Assessing the Effect of Screen Mockups on the Comprehension of Functional Requirements"],"prefix":"10.1145","volume":"24","author":[{"given":"Filippo","family":"Ricca","sequence":"first","affiliation":[{"name":"DIBRIS, University of Genova, Genova, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giuseppe","family":"Scanniello","sequence":"additional","affiliation":[{"name":"DiMIE, University of Basilicata, Potenza, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marco","family":"Torchiano","sequence":"additional","affiliation":[{"name":"DAUIN, Politecnico di Torino, Torino, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gianna","family":"Reggio","sequence":"additional","affiliation":[{"name":"DIBRIS, University of Genova, Genova, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Egidio","family":"Astesiano","sequence":"additional","affiliation":[{"name":"DIBRIS, University of Genova, Genova, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"320","published-online":{"date-parts":[[2014,10,7]]},"reference":[{"key":"e_1_2_2_1_1","doi-asserted-by":"publisher","DOI":"10.1109\/TSE.2012.27"},{"key":"e_1_2_2_2_1","unstructured":"S. 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