Abstract:This paper revisits the 'exogenous productivity of judges' hypothesis, laid down in numerous law & economics studies based on the production-function approach. It states that judges, when confronted with growing caseload pressure, adjust their productivity upward, thereby increasing number of resolved cases. We attribute this result to assumptions regarding court productivity. In this paper, we present an alternative -the 'hockey-stick' production function model --taking into account the time constraints faced by judges. We seek to reconcile this 'production function' model with more traditional and popular approach among practitioners to court performance modelling -the use of weighted caseload methodology. We also propose extended methodology of model evaluation, taking into account its ability to reproduce empirical regularities observed in 'real world' court systems.Keywords: court efficiency, caseload management, judicial productivity, production function, weighted caseload JEL Code: H 11, H 50, K40,Remember that all models are wrong; the practical question is: how wrong do they have to be to not be useful?