“…Studies have found little change in response rates when web follows mail first (Dillman et al, 2014). However, significant increases in response were reported in studies where the web survey mode was first, followed by mail (Dillman et al, 2014;Lang, 2007;Messer & Dillman, 2011;Millar & Dillman, 2011). Concerning timing of mode switch, Wagner et al (2017) found no significant difference in response rates when switching modes after the first, second, third, and fourth contact leading to the recommendation of switching at the final contact to the more expensive mode.…”