The condition and performance indices needed to be specific enough to provide good comparison between systems, but general enough to be able to obtain the information without imposing an unreasonable burden on the people providing the data. After much discussion, we agreed that subjective but expert evaluation of systems using the condition descriptions as guidelines has objective validity, and adapted the table below as a guideline. We decided not to use purely predictive parameters, such as age or consequences of failure, as a sole grading criteria. Some aging or wear may be visible. Immediate action is not required.
Function is still adequate.