Sentence:  The architects do not believe that the education of the interior designer is sufficiently good or sufficiently extended to compare with that of the architect and that , therefore , the interior designer is incapable of understanding the architectural <WSD>principles</WSD> involved in planning the interior of a building . 
Meaning of the word marked with <WSD> tags:  a basic generalization that is accepted as true and that can be used as a basis for reasoning or conduct