This study sought to insert the systemic view provided by the ergonomic approach in the design practice of the office workspace, particularly in the aspect of delimiting the amount of area occupied by the user. It was verified that technical publications and regulatory norms provide data to mark office space, but it was identified in the specialized literature deficiency in the application of specific data of identification of the activities and the quantification of space. A methodology based on the Hypothetical-deductive research method was developed. As a case study, an office of a public office was proposed. From the analysis of the workspaces, it was noticed that, besides the dimension, the form of distribution influenced directly in the functionality of the same, concluding that not only the quantity of space determined its functionality, but that the form of distribution and use of work surfaces directly influences the functionality of the workspace. This article was extracted from the doctoral thesis of the author Costa.