(Lee's organization is not a comprehensive classification, but a selection of orders considered common or important.)
The first comprehensive classification to reflect this was .
However, comprehensive classification is elusive, because a vehicle may fit into multiple categories, or not completely satisfy the requirements for any.
To date, George's 1999 arrangement remains the most recent comprehensive classification.
Thiele (1925, 1929 and 1931) set up the most comprehensive classification, with a review of the family at generic level.
As he stated (1987:337): "The ultimate goal is a comprehensive classification of what is very likely a single language family."
The only comprehensive classification along these lines going beyond a simple listing of languages dates back to 1991.
It is instead a comprehensive classification of project scope.
The reason was to provide a more comprehensive and detailed classification to take newer employment patterns into account.
McKenna was best known for publishing a comprehensive classification of mammals.
