“…The most used research methodology for data gathering is of a qualitative nature, through in-depth face-to-face or telephone interviews and/or focus groups. Yet, several investigations of a quantitative nature have applied questionnaires for data collection (Barreto, 2015; Abdullah et al , 2013; Kolade and Kehinde, 2013; Babatunde et al , 2012; Barnabas et al , 2009; Menches and Abraham, 2007), and other multi-method studies use both a quantitative and qualitative perspective (Alessandrini and Winter, 2014a, 2014b; English and Le Jeune, 2012; Worrall et al , 2010; Construction Sector Council, 2010; Eliufoo, 2007). The size of the samples varies greatly, from 7 participants (Lu and Sexton, 2010) up to 1,290 (Construction Sector Council, 2010).…”