To be included in this list an incident must meet two criteria: (1) It must be an extremely bad or otherwise significant failure. (2) It must be a notable blunder--that is, it must be widely considered to be a disaster which was the result of bad decision making. To be objectively considered famous, it must appear in a list of blunders compiled by a respectable authority or be noted as a blunder by multiple, unbiased sources. If there is disagreement as to the nature of the blunder, or whether it is even a blunder at all, then the opinions of both sides should be summarized in the listing.