Commons and global public goods have become popular concepts in academic debates on governance. Moreover, these concepts are no longer the exclusive domain of economists. Different disciplines (such as legal and politi-554 Nicolás Brando et al. cal theory) have appropriated them in their own specific ways. The result of this popularity, however, is that they are often confused or used in ways that muddle their distinct characteristics. In this article we propose some distinctions to clarify the use of these concepts. First, we will show how what were initially social scientific concepts started being used in a more normative way. Second, we will subject the writings of Elinor Ostrom and Inge Kaul and colleagues to a discourse analysis. This means that we will show that some normative assumptions are already present in the concepts of 'commons' and 'global public goods'. We take it that, although Ostrom and Kaul are often read as social scientists, it is both possible and fruitful to read them as proposing two very different visions of power in a globalizing world. In a third section we then demonstrate more concretely what these visions look like. Finally, we conclude by looking at the possible advantages and downsides to both models.

The modeling approach outlined in this study provides an ideal form for advanced model-based control system design. The relatively low number of parameters makes it well suited for model-based control purposes, as a limited number of identification experiments is sufficient to determine these parameters. The model concept provides information about the air quality and airflow pattern in an arbitrary building. By using this model as a simulation tool, the indoor air quality and airflow pattern can be optimized.

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