A etapa de execução da obra: um momento de decisões

This paper presents the experience of ergonomie intervention in tive construction phase oftlie Integrated Control Center of a Brazilian petrochemical industry. Vie project of this building was developed with tlie participation oftlie ergonomics team since the preliminary studies. By means of a methodology based in weekly meetings attend by tlie various teams taking part in this project, success was met, specially, in the conduction of the reconception of the project -a common situation in a building construction. Tlie main factors that led to this reconception were the absence of an executive project; the working conditions on tlie work-site; constant variation in materials available on the market; discontinuity of the teams involved and indefinition as to the organized work plan.