In this master thesis, the sustainability criteria are examined with regard to their relevance and their interactions with each other, and the planning process is analyzed, taking the sustainability criteria into account. Based on the requirements of the ÖGNI / DGNB certification system, the "most important" criteria are filtered out. These are the ones that have a high impact on the overall assessment because of their significance factor and their weighting and are important in terms of different aspects, as well as those that have a high number of interactions with other criteria. The interactions of the criteria among each other is illustrated on the one hand as a matrix of interactions on the basis of different interpretations of their "internal relationships", their "correlations" and the references cited in the criteria profiles, and on the other hand "qualitative interactions" are also analyzed. Decisions that influence individual sustainability criteria and thus influence the sustainability of a building are made during the whole planning and construction process and measures are taken in all planning and performance phases. Therefore, the planning and project phases are presented in this master thesis and the criteria are assigned to the planning process on behalf of the presence of information in the construction process, the application of functional specification of the planning services, activities in life cycle management and information in the criteria profiles. This evaluation shows the importance and influence of the early project and planning phases on decisions and measures regarding the sustainability criteria. In order to provide an overview of the requirements for the responsibilities and the planning process resulting from the sustainability assessment, the project participants and possible planning instruments for sustainable buildings are first presented. Subsequently, the previous considerations are linked and measures and services related to sustainability criteria are assigned to planning phases and responsibilities are cited. This provides a description model for the practice, which can serve as a template for the implementation in concrete projects.