Stew beef, overcooked or undercooked? If my stew beef is tough (it's been on a small flame in liquids for about an hour), does it mean that it is overcooked, or undercooked?
Generally speaking when speaking of "stew beef", the meat will break down more the longer you cook it. I often make shredded beef for tacos out of that cut by simmmering it for a few hours or more. At 1 hour, I'd say it was undercooked.

For example: http://www.foodnetwork.ca/recipes/Main/Beef/recipe.html?dishid=1772

In there he recommends using stewing beef, browning it first and then "... stew until the meat is tender and can be cut with a spoon. This will take at least an hour and a half."