+ defined as the act of finding ways to deal with problems . + need to develop skills and strategies to identify problem and find solutions to solve it. + the moment where you suddenly know how to solve a problem. Easy problem = get rid of 0"s so it would be 18/9. We make simple questions more difficult than it needs to be. + the circle represents the altar window and the area around it represents the space that"s adjacent. + want to circle the area around the altar window need to figure out how much paint i need. + structurally-blind thinking bringing in background knowledge to solve the problem, makes it much harder to solve it. + productive thinking is easier thinking, more simple. + know it"s counterfeit cause it"s lighter than the others. + determine which one use of a scale. There"s a mental rigidity of how we think of a problem.