“…IS investment is measured differently in the reviewed literature, more specifically in the longitudinal empirical research. IS annual budget (also known as IS spending, IS expenditures) (e.g., Baker et al, 2008;Havakhor et al, 2019;Peslak, 2003;Walsh et al, 2010) is the most frequently used variable to measure the magnitude of IS investment. Other approaches include IS capital (e.g., Barua et al, 1995;Kleis et al, 2012;Tam, 1998), IS capital scaled to total assets (e.g., Chowdhury, 2006;Dewan & Ren, 2011;Xue et al, 2012), IS budget scaled to sales or revenue (e.g., S. Aral & Weill, 2007; J. K. Kim et al, 2009;Mithas et al, 2016), IS budget scaled to total operating costs (e.g., Thouin et al, 2008), IS budget per employee (e.g., Mithas et al, 2012;Ray et al, 2005), and IS capital per employee (e.g., Bloom et al, 2012).…”