Reason for Outage codes

[jancebk]

I am leading an effort to standardize the "Reason for Outage" codes used when an incident is closed in Incident Management. This set of codes is used in support of the Incident and Problem management processes to analyze incidents. Peregrine Service Center - Incident Management was implemented enterprise wide about a year ago. Now looking to standardize the "Reason for Outage" codes across the organization. The help desk serves over 50,000 customers and multiple lines of business.

I'm looking for advice on how others have developed, standardized & implemented these codes across a very large organization.

What type of schema have you used?

Thank you in advance!
Jan