Whether one is considering implementing one of the ITIL Service Management processes or undertaking a full ITIL implementation it is imperative to obtain Management commitment and buy-in as far up the organization as possible. Fundamentally, it demonstrates and provides commitment to the initiative, which if the commitment is at the top of the Management hierarchy permeates downwards through the organization. Ultimately the implementation and commitment to ITIL should form part of the IS / Business strategy.
In support of the above it is also worthwhile considering a Communication Plan or Strategy, which operates throughout the lifetime of the initiative, project or program, thus ensuring the organization as a whole is brought in to the initiative.