The following system is used in the Chemicals Wikiproject, for assessing how close we are to a "complete" page on a particular compound. The system is based on a letter scheme which reflects principally how complete the article is, though the content & language quality are also factors. Once an article reaches the A-Class, it is considered "complete", although obviously edits will continue to be made.
It is critical that people not take these assessments personally. It is understood that we all have different priorities and different opinions about what makes a perfect article. It is proposed that each one of our lists of goals from the organization page should have a coordinator who performs the monthly (or 3-monthly) assessment on each page on that list. The only exception to this will be new pages written by the coordinator, which should receive an initial assessment from someone else. See Wikipedia_talk:WikiProject_Chemicals for more details on this.