Abstract
Vattenfall is about to create a standard that will be used during inspections of their generators. The method chosen to create the new standard is to speak with people that works with the inspection of the generators. They have a lot of experience and knows how to interpret signs and when it is time to maintain the generator. The purpose is to see and take care of problems before they lead to a breakdown. That is made by using condition based maintenance. To estimate how to do the right assessment when noticing different behaviour of the generator was not the only problem. It is also difficult to understand what should be checked during inspection and there for a new inspection list has been created. To make data collection useful there must be a proper way in handling data. When handling data in a correct manner the opportunity to make the right decisions based on facts increase.