This model was later presented in a varied form (Wilson, 1999), and – with the other
1981 models – used as the basis for a revised and general model of information
behaviour (Wilson and Walsh, 1996; Wilson, 1999). This family of models have proved
valuable in allowing the inclusion for personal and psychological factors, as well as the
context of information seeking (see, for example, Heimstro¨m (2005).