Os riscos profissionais e a sua gest o em contexto: dois objectos para um objectivo de forma o comum

This article presents a study on occupational risks management in the area of supply and delivery of ready-to-use concrete on construction sites or public works.. Our analysis articulates the contribution of ergonomics to understand the work system, identify the risks factors and propose change in particular areas of the work system with the aim of preventing occupational risks. Professional didactics contributes to identifying and referencing occupational knowledge by taking an interest in the characteristics of work situations and transferring this knowledge into training situations to facilitate its acquisition by operators, in order to direct instruction in initial or continuing training. This dual approach allows us to show that, in this professional field for operators involved in delivery, managing risks does not only mean identifying the risks in a situation and managing them when the situation allows it or refusing to complete the delivery: it is crucial to have the power to decide not to deliver considering the identified risks.