Organisational citizenship behaviour (OCB) plays a pivotal role in organisational success. This research explored factors hypothesised to facilitate OCB within a primary school context. Two studies using questionnaire survey’s explored: (i) OCB relative to personal differences and psychological contracts; (ii) the relationship between OCB and principals’ leadership frames. Primary school teachers were recruited and responses analysed from 547 and 488 respondents, respectively. Results from both studies combined suggest that the leadership style of the principal and the employee’s expectations of their role within the school strongly influence their OCB. This study identifies factors that influence the prevalence of OCB in primary school teachers and confirms that the new theoretical framework provides a useful heuristic for managers, human resource management policy makers and academic researchers alike.