Using the theory of planned behaviour, this research investigates whether a computerised system is capable of inducing the intention, and consequently the behaviour of individuals, to monitor public management. The CidadES -Controle Social system was the object of study and the data collection was conducted through an electronic questionnaire. Using structural equation modelling with partial least squares estimation, results indicate that intention and behaviour are mainly influenced by the usefulness that individuals attribute to this type of system. The present study broadens the understanding of behaviour in the use of e-Government systems within the important dimension of social accountability.