List the two main types of problem. What is the approach followed in solving these problems?

Problems are broadly divided as well defined problems and ill-defined problems. Well defined problems can be solved by following a formula, and there is always a path to the best solution clearly implied. Solving ill-defined problems requires research, analysis, creativity, and judgment. Solving ill-defined problems involves combining existing resources with innovation and good judgment. Heuristics may be used to aid in the solving of an ill-defined problem, but they cannot be relied on entirely and a solution must be adapted according to the situation. Ill-defined problems do not have a perfect solution but a good solution can be developed with proper research and analysis.