“…Moreover, attempts to regard user strategy as invariant are at odds with the many studies reporting individual flexibility and creativity in scheduling (Crawford & Wiers, 2001; Sanderson, 1989; van Wezel & Jorna, 2001). Mental flexibility also depends on expertise (Bi & Salvendy, 1994; Mietus, 1994; O’Neil, Ni, Baker, & Wittrock, 2002), cognitive styles (Cegarra & Hoc, 2006; Schilhavy, 2003), the department the person works in (Kiewiet, Jorna, & van Wezel, 2005), cultural differences (Jorna, 2006), and the nature of the situation (Cegarra, 2008). At the same time, some authors have noted individual differences in strategies in very comparable contexts, highlighting the creativity that may emerge when looking for innovative solutions to scheduling problems (e.g., Cowling, 2001; Mietus, 1994; Taatgen, 1999; Wiers, 1996).…”