The conceptualisation of the different data sources which is influenced by the designers' view of the concepts and the context to be modelled. Different data sources use different contexts to give meaning to the data.

Cui, Zhan, and Paul O'Brien. "Domain ontology management environment." System Sciences, 2000. Proceedings of the 33rd Annual Hawaii International Conference on. IEEE, 2000. [http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=926977]