The ITIL Community Forum Forums-viewtopic-Order of Implementation
From the above forum you will see that everybody has a different take on this. I also have my own views, unfortunately different ones from my employer...
In the above forum, one suggestion is made to start with Service Level Management. Theoretically, it would be the perfect option, but how are you going to negotiate SLA's on your MTTR (Mean Time To Repair) if you are not measuring your MTTR through Incident management to have an idea of your capabilities and of what a realistic MTTR would be for your support teams. It may however be a good idea to start with a Service Catalogue, but that is only an aspect of Service Level Management and not a process.
A lot of people believes that one must start with Configuration management. Again, my believes are that it would be perfect in theory, but in practice it is a different story. How will you keep your CMDB up to date, if you do not have a mature enough Change management process to keep the data up to date? A discovery tool will help, but there are still information that may need manual updates via Change management, e.g. costs, locations, users asset tag nr's etc. Configuration management is aslo one of the most difficult processes in my mind, that is if you want to do it properly...
The best place to start in my opinion is with Change Management. Gartner reports that 80% of infrastructure failures are caused by changes. So, if you can have ALL your changes under control as soon as possible, a lot of these failures will be prevented. That is defnitely a quick win and quick wins is what you want to keep the motivation of support teams up and keep upper manageemnt committed to your project. It may be a while to realise the benefits of Service Level Management or Configuration Management.
A good one would also be Incident Management, it is a fairly easy process and it is also good to start with easier processes so that everybody get's a chance to learn as they go along.
When Change and Incident management are well on their ways you can start to look at the other processes, especially on the Service Support side...
Oh yes and obviously you will need a Service Desk right from the start...
My take on where not to start...
Problem Management - Can't have it without Incident Management
Configuration Management - CMDB will be out of date in no time without Change Management.
Service Level Management - Can start certain aspects, but no baseline without Incident and Change Management to negotiat SLA's with the customer.
IT Service Continuity Management - Difficult and expensive, no quick wins, good to have the CMDB first... Don't get me wrong, it IS important, but not my suggested place to start.
Release Management - You preferably need Change Management first.
Available & Capacity management - Possible to start with, but no real quick wins and more difficult...the ITIL books really get theoretical on these guys and even a bit abstract.
Well, these are only my views, whether you agree or not.....