The Guide to the Software Engineering Body of Knowledge (SWEBOK) covers 15 knowledge areas representing most of the software engineering content in exams taken by those seeking to become licensed software engineers in the US. It is also the basis of an international set of training materials created by the IEEE Computer Society. SWEBOK was first published in 2004 and contained 10 knowledge areas. SWEBOK 3.0 was released in 2013 and reflected software engineering's evolution by including 15 knowledge areas, reviewed by approximately 150 experts in 33 countries.