William Kahn provided the first formal definition of employee engagement as "the harnessing of organisation members' selves to their work roles; in engagement, people employ and express themselves physically, cognitively, and emotionally during role performances." Kahn (1990).
In 1993, Schmidt et al. proposed a bridge between the pre-existing concept of 'job satisfaction' and employee engagement with the definition: "an employee's involvement with, commitment to, and satisfaction with work. Employee engagement is a part of employee retention." This definition integrates the classic constructs of job satisfaction (Smith et al., 1969), and organizational commitment (Meyer & Allen, 1991).
Defining employee engagement remains problematic. In their review of the literature in 2011, Shuck and Wollard [2] identify four main sub-concepts within the term:
1. "Needs satisfying" approach, in which engagement is the expression of one's preferred self in task behaviours.
2. "Burnout antithesis" approach, in which energy, involvement, efficacy are presented as the opposites of established "burnout" constructs: exhaustion, cynicism and lack of accomplishment.
3. Satisfaction-engagement approach, in which engagement is a more technical version of job satisfaction, evidenced by Gallup's own Q12 engagement survey which gives an r=.91 correlation with one (job satisfaction) measure.[3]
4. The multidimensional approach, in which a clear distinction is maintained between