The fusion between building assessment and design can lead to better informed design decisions. Performance oriented design is better supported through the use of interoperable file formats for data exchange between BIM and non-BIM tools. At the same time, the parameters that influence the calculation during a performative assessment are no longer a purely engineering problem, since 3D modeling is of primary importance in defining the numerical output. The role of the designer along with the selection of the tools becomes all more relevant in this direction. A framework is presented hereby, which can be used for the selection between different BIM tools for daylight assessment. An insight is also given on the major parameters that can affect the outcome and on the obstacles that were experienced in four case-studies in relation to data exchange and information flow.