Diversity ? Heterogeneity
A wide variety of knowledge is needed to interpret the data
A large variety of experts is developing this knowledge
The scope of interests differs among those experts
The knowledge is expressed in diverse ways
The terms differs in precise meaning: semantics
A large variety of data types is needed
A wide variety of representations is used
The database and file schemas differ
A wide variety of representations is used
The openness and accessibility of the information differs