“…In general, various factors of the internal environment, which potentially influence the performance of SMEs, are mentioned in the literature. Of these, particular attention is paid to: firm age and size (Arend, 2014;Nicolini, 2001), human resources and human resource practices (Katou, 2012;Sheehan, 2013), entrepreneurial networks (Bratkovi c Kregar & Anton ci c, 2016;) occupational health and safety measures (Gopang et al, 2017), product, process, organisational, marketing innovation (Altuntas, Cinar, & Kaynak, 2018;Wolff & Pett, 2006), sustainable leadership (Suriyankietkaew & Avery, 2016), planning and strategy (Arag on-S anchez & S anchez-Mar ın, 2005; Leitner & G€ uldenberg, 2010), organisational orientations (market, entrepreneurial, and learning orientations) (Lomberg, Urbig, St€ ockmann, Marino, & Dickson, 2017), internationalisation (Chiao, Yang, & Yu, 2006;Majocchi & Zucchella, 2003), export (Altuntas et al, 2018), market orientation, planning flexibility (Alpkan et al, 2007), ownership and family involvement (Lien & Li, 2017), intellectual capital (Gomezelj Omerzel & Smol ci c Jurdana, 2016), etc.…”