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Although people believe that both the Semantic Web (SW) and SW applications scale up,we have to make sure we know what they mean by ‘scale up’ in order to properly understand the research on the SW.It is definitely true that the data on the World Wide Web (WWW) scales up.It is also true that Linked Data scales up.How about the SW data? If it does,in what sense does it?Let us look back at the history of knowledge bases and investigate expert systems to understand in what sense knowledge bases in expert systems did not scale up.A couple of critical issues in expert systems include the fact that it is very hard to build a very large knowledge base,and it is also hard to maintain it.So,people cannot hope to build an expert system which covers most of the tasks operated within a company.This is why people say "Expert systems do not scale up".