Here is the preliminary research:

http://www.yellowstone-bearman.com/campw_bears.html

“Never camp in an area that has obvious evidence of bear activity such as digging, tracks, or scat.”

?But we are supposed to stay in approved camp sites that have supposedly bear-proof boxes. Doesn’t this mean we are required to camp in areas of known bear activity?

“Odors attract bears, so avoid carrying or cooking odorous foods. Keep a clean camp; do not cook or store food in your tent. All food, garbage, or other odorous items used for preparing or cooking food must be secured from bears.”

And:

“Treat all odorous products such as soap, deodorant, or other toiletries in the same manner as food. Do not leave packs containing food unattended, even for a few minutes.”

“Sleep a minimum of 100 yards (91 meters) from where you hang, cook, and eat your food. Keep your sleeping gear clean and free of food odor. Don't sleep in the same clothes worn while cooking and eating; hang clothing worn while cooking and eating in plastic bags.”

“Food bags should be hung a minimum of 10 feet from the ground and a minimum of 4 feet horizontally from any post or tree. Garbage should also be treated the same as all other food items, and suspended or secured in a bear proof container. Deposit human waste at least 200 yards from camp.”

“ Check your campsite out carefully before spending the first night. If you do find garbage or other food items on the ground left by the previous campers, it would be recommended that you increase the distance you set your tent from the cooking area at least double. Remove and secure any garbage left behind by the previous irresponsible campers and report the incident….”

“If you have a bear come into camp late at night keep in mind that this is different from a surprise encounter during the day while hiking. If a bear comes into camp, you must treat this encounter seriously and react aggressively.”

And:

“Individuals who have aggressively yelled at the bear, banged pots and pans, or thrown rocks or other objects to distract the bear generally have then had time to move away to safety or, they drove the bear away with the first yell, and aggressive action.”

“Hikers and hunters who have stood their ground, stayed calm, played dead or have sprayed "bear spray" have generally walked away with few, or no injuries. Spraying pepper spray (bear spray) and or falling to the ground and "playing dead" should ONLY be done as a last resort.”

“Making plenty of noise, and alerting any nearby bears of their presence.”

“Predatory attacks by bears usually start off slowly and calmly when one or two hikers encounter a bear at some distance and the bear slowly approaches them and the hikers try to move away only to have the bear follow them. Basically what is happening is the bear is testing the hikers, and possibly the bear may have done this in the past and had a timid hiker drop their pack or even food on the ground and the bear has obtained a food reward and has learned that pushing people will result in a "reward". Or, the bear may actually be looking at the hiker or couple as a potential food source.
This latter scenario is more common with black bears although it has happened with grizzly (brown) bears and if the bear is not aggressively pushed back or sprayed with "bear spray" the bear has finally attacked and then consumed the person.”
• “Dropping a hat or coat seems to work, while slowly backing up,
• Talking softly seems to work very well and helps to diffuse the situation.
• Never take your pack off.
• Drop down and lay flat on the ground with your hands on the back of your neck.....only as a last resort when it becomes obvious that the charging bear is not going to stop and is about to make contact. Do not move or make noise until it is obvious that the bear has left the area.
• Spray "Bear Spray" only as a last resort, but before dropping to the ground.
• There is some evidence that you should not look the bear directly in the eye, but look down and to the side acting submissive keeping the bear in your vision.
• Periodic sounds of clapping and maybe a "Hey Bear!" once in awhile just seems to fit better and do as well, or better than the constant ringing of bells.
Recommended bear spray:
http://www.counterassault.com/html/beardeterrent.html


REI
http://www.rei.com/expertadvice/articles/bear+resistant+canisters.html
A bear's food-stealing repertoire includes:
• Bashing windows of locked vehicles to get to food coolers (which bears have grown to visually recognize and associate with food). Bears have broken open vehicles just because a soda can or gum wrapper was left visible. (Solution: Don't leave such items inside a vehicle, or at least conceal them thoroughly—only if no other food-storage options are available.)
• Breaking the rear windows of cars, then clawing through the back seats in order to get at aromatic items locked in trunks. (Solution: Remove food from a vehicle when you park; if available, store it in a bear box.)
• Sending cubs up trees to dislodge nylon food bags dangling from limbs. (Solution: Use a portable, bear-resistant food canister.)
• Gnawing through limbs several inches thick to make suspended food bags drop. (Solution: Same as above.)