This study puts self-determination theory to an empirical test through a series of discrete choice experiments across three samples of public healthcare workers, for a total of 4,743 subjects. The three replications provide convergent evidence in support of the hypotheses that autonomy, competence, and three types of relatedness -with supervisors, peers, and beneficiaries -simultaneously and independently increase employee satisfaction. Meaningful differences emerge in the relative importance of those five factors. In particular, the fulfilment of one's need for competence turns out to have the greatest positive impact across experimental replications, whereas the need for autonomy consistently comes last. KEYWORDS Self-determination theory; job satisfaction; behavioural public administration; conjoint analysis; public employees "All employees have three basic psychological needs -for competence, autonomy, and relatedness -the satisfaction of which promotes autonomous motivation, high-quality performance, and wellness" -Deci, Olafsen, and Ryan 2017, 19 -Work motivation and job satisfaction are two of the most popular constructs in contemporary general management (e.g. Bolino and Grant 2016), organizational psychology (e.g. Deci, Olafsen, and Ryan 2017), and public administration (e.g. Perry, Hondeghem, and Wise 2010). Studies into the motivational bases of public service have flourished over three decades, spurred by nascent public service motivation research (e.g. Perry and Wise 1990) -a topic which has drawn thrived like few other topics within our field (e.g.