I assume that you — the reader — are either an ITIL® V3 Foundation certification holder, or you’re been working on ITIL® processes for a long long time, and you’re thinking of getting certified.
To embark on a journey towards the ITIL® Expert certification, the ITIL® V3 Foundation is mandatory. The Expert certification is not just one exam, but a number of exams, each consisting of certain credits. Depending on the path you choose, you would end up taking five or six modules before the crowning ceremony.
Formal training through Accredited Training Organization (ATO) or approved e-training courses are mandatory before taking up each exam.