  IAU Symposium 232 allows a snapshot of ELTs at a stage when design work in
several critical mass projects has been seriously underway for two to three
years. The status and som eof the main initial design choices are reviewed for
the North American Giant Magellan Telescope (GMT) and the Thirty Meter
Telescope (TMT) projects and the European Euro50 and the Overwhelmingly Large
(OWL) projects. All the projects are drawing from the same "basket" of science
requirements, although each project has somewhat different ambitions. The role
of the project offices in creating the balance between project scope, timeline
and cost, the "iron triangle" of project management, is emphasized with the OWL
project providing a striking demonstration at this meeting. There is a
reasonable case that the very broad range of science would be most effectively
undertaken on several complementary telescopes.
