Every field note helps building a history of activity at the project site. Every visit should result in a field note, including visits by peers and 3rd parties. Visits can be before implementation, during implementation and during operational state.
If the field note is during the operating phase of the project, then PWX considers the note as a verification note. Verification can show if the current operating state is different from that in the 'final' report and thus draw attention and resources to resolve issues.
Soon PWX AnalytiX will track the number of projects verified and combine that with the amount of time elapsed since 'completion', to summarize monitoring efforts and the sustainability of projects.