Representing 'just invalid' knowledge

Data, information and knowledge are all represented in a single formalism as "items". Items contain two types of acceptability measures that measure the invalidity of item instances. Objects are item building operators that also contain two types of acceptability measures. These acceptability measures define a graduated acceptability region for data, information and knowledge. This region represents 'just invalid' knowledge. A quantitative calculus estimates the extent to which a knowledge base may be expected to extend into this region as time passes. This calculus is simplified by the use of the unified knowledge representation. A single rule of knowledge decomposition simplifies the structure of the conceptual model. Expressions in this calculus are simplified if the knowledge has been decomposed.