In a 2004 survey designed by Noel Bruton (author of "How to Manage the IT Helpdesk" and "Managing the IT Services Process"), organizations adopting ITIL were asked to relate their actual experiences in having implemented ITIL. Seventy-seven percent of survey respondents either agreed or strongly agreed that "ITIL does not have all the answers". ITIL proponents accept this, citing ITIL's stated intention to be non-prescriptive, expecting organizations to engage ITIL processes with existing process models. Bruton notes that the claim to non-prescriptiveness must be, at best, one of scale rather than absolute intention, for the very description of a certain set of processes is in itself a form of prescription.
Taking this strategy on board offers a number of advantages for businesses. Perhaps most notably, it can cut back on the amount of time and money that gets wasted throughout the service development lifecycle, while also raising the quality of the end-product. This, in turn, can provide a huge boost to customer satisfaction once a service or product is implemented, as well as the morale of staff working on it.
Prior to taking any of the ITIL exams, you should be able to pass any of the sample ITIL exams that are available online. A list of online ITIL sample exams can be found here; updated as of 2014. Professional ITIL exam preparation kits can also be found online, for a fee. ITIL Prime, for example, offers access to more than 800 ITIL Foundation questions for $59.
The good news about ITIL certification is that it is a valuable skill for almost any IT professional, from system administrators to chief information officers (CIOs). Many large companies have dedicated ITIL coaches or mentors who help shepherd projects through the various steps of the ITIL framework. These ITIL gurus have a wide understanding of the IT landscape and can usually spot trouble with a service design document or implementation plan in a matter of minutes.