The Product Knowledge Base is a Case Base and contains the actual success cases of manufacturing car seats with different materials as well as the failure cases, where certain quality requirements have not been satisfied by the product of the industrial manufacturing process. These success and failure cases are denoted by and , where is an index for referencing the specific case and identifies that the case resulted from industrial experience.
In addition to these industrial cases, the results from systematic experimentation, that is performed in material sciences research institutes should also be stored in the Product Knowledge Base. In order to determine the thermodynamic behavior of GMTs during the pressing process, researchers may for instance perform experiments, where several different parameters are systematically manipulated to determine their influence upon some criterion variable. Such scientific research may determine, ``which influences different production parameters have on the work done on the material and what kind of flow characteristics different GMT-materials show'' [\protect\citeauthoryearKissinger1993]. Such experiments may investigate how the closing speed of the tools, the press force and the specific material determine the size of the pressed material. The experimental results can provide very useful information for the product engineer, who is interested in manufactoring some specific car seat. The actual data from such experiments should therefore also be stored in the case base. We denote such cases from scientific experimentation by , where the index indicates that this result was achieved by science research and is an index that denotes the specific experiment.