Search Results During the searches (with all the defined search strings), we obtained several results that were not relevant for the review and were discarded. The majority of unused results referred to domain analysis/ software product line processes, domain design and experience reports that did not included and tool evaluation. To do the filter of which results were relevant or not, we superficially read the result’s title, abstract and keywords (when available). Furthermore, some of the processes description results had as future work a tool implementation or referred to existing tools. The tools name were used as search strings in order to find them. Per research engine: ACM Digital Library Search String: “domain analysis tool” Date: December 11, 2007 Relevant result: [Morisio 2000], [Succi 2001b], [Beuche 2003], [Antkiewicz 2004], [Spinczyk 2004], [Eriksson 2005], [Leich 2005], [Kim 2006] and [Dhungana 2007b] Search String: “Software product lines tool” Date: December 11, 2007 Relevant results: [Kim 2006], [Dhungana 2007b], [Succi 2001b], [Beuche 2003], [Eriksson 2005], [Spinczyk 2004], [Succi 2000] , [Antkiewicz 2004], [Leich 2005], [Krueger 2007] Search String: “domain engineering tool” Date: December 11, 2007 Relevant results: [Ge 2005], [Morisio 2000], [Krueger 2007], [Beuche 2003], [Spinczyk 2004], Search String: “feature modeling” Date: December 11, 2007 Relevant results: [Forget 2007], [Antkiewicz 2004],[Eriksson 2005], [Leich 2005], [Beuche 2003], [Spinczyk 2004],[Ge 2005],[Krueger 2007], Search String: “variability modeling tool” Date: December 11, 2007 Relevant results: [Antkiewicz 2004],[Eriksson 2005], [Leich 2005], [Beuche 2003], [Spinczyk 2004],[Ge 2005], [Dhungana 2007b], Search String: “software product line requirement tool” Date: December 11, 2007 Relevant results: [Antkiewicz 2004],[Eriksson 2005], [Leich 2005], [Beuche 2003], [Spinczyk 2004],[Ge 2005], [Dhungana 2007b],[Krueger 2007], Total unique papers and journals -> 13 IEEE Computer Society Digital Library Search String: “domain analysis tool” Date: December 12, 2007 Relevant result: [Frakes 1997], [Succi 1999] , [Lee 2007], [Morisio 2000], [Beuche 2003] Search String: “Software product lines tool” Date: December 12, 2007 Relevant results: [Succi 2001b], [Succi 2001a], [Morisio 2000], [Succi 2000], [Dhungana 2006], [Gomaa 2002] Search String: “domain engineering tool” Date: December 12, 2007 Relevant results: [Morisio 2000], Search String: “feature modeling tool” Date: December 12, 2007 Relevant results: [Gomaa 2002] Search String: “variability modeling tool” Date: December 12, 2007 Relevant results: [Dhungana 2006] , [Rabiser 2007b], [Moon 2005] Search String: “software product line requirement tool” Date: December 12, 2007 Relevant results: [Rabiser 2007a], [Dehlinger 2007] Total unique papers and journals -> 10 Science@Direct Search String: “domain analysis tool” Date: December 13, 2007 Relevant result: [Asikainen 2007], Search String: “Software product lines tool” Date: December 13, 2007 Relevant results: [Kim 2008] Search String: “domain engineering tool” Date: December 13, 2007 Relevant results: [Kim 2008] Search String: “feature modeling tool” Date: December 13, 2007 Relevant results: [Asikainen 2007], Search String: “variability modeling tool” Date: December 13, 2007 Relevant results: [Asikainen 2007], Search String: “software product line requirement tool” Date: December 13, 2007 Relevant results: [Kim 2008], [Asikainen 2007] Total unique papers and journals -> 2 SpringerLink Search String: “domain analysis tool” Date: December 13, 2007 Relevant result: Search String: “Software product lines tool” Date: December 13, 2007 Relevant results: [Zhang 2004], [von der Massen 2004] Search String: “domain engineering tool” Date: December 13, 2007 Relevant results: Search String: “feature modeling tool” Date: December 13, 2007 Relevant results:, Search String: “variability modeling tool” Date: December 13, 2007 Relevant results: [Zhang 2004], [Sinnema 2006] Search String: “software product line requirement tool” Date: December 13, 2007 Relevant results: Total unique papers and journals -> 3 Google Search String: “domain analysis tool” Date: December 13, 2007 Relevant result: [Tracz 1995], [Krut Jr. 1993], [Frakes 1998], XFeature tool (http://pnp-software.com/XFeature/) Search String: “Software product lines tool” Date: December 13, 2007 Relevant results: BigLever company – GEARS tool (www.biglever.com), MetaEdit+ tool, [Succi 2000] Search String: “domain engineering tool” Date: December 13, 2007 Relevant results: GMT tool (http://www.softmetaware.com/generativemodeltransformer.html), Search String: “feature modeling tool” Date: December 13, 2007 Relevant results: [Forget 2007], XFeature, featurePlugin Search String: “variability modeling tool” Date: December 13, 2007 Relevant results: [Dhungana 2007a], Search String: “software product line requirement tool” Date: December 13, 2007 Relevant results: Total unique papers and journals -> 4 Tools -> 3 Found references through direct search: Antkiewicz, M. and Czarnecki, K. 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