TRIZ, literally: "theory of inventive problem solving" is the next evolutionary step in creating an organized and systematic approach to problem-solving. It is based on the principle that any engineering problem can be solved using a simple set of tools and techniques. The key to success is to apply the tools and techniques in a creative, flexible and innovative way. This means thinking outside the box and looking for creative solutions that are not immediately obvious. One of the key principles of TRIZ is "partial, overdone or excessive action". This means that sometimes perfection is either impossible or too expensive to consider. What you can always consider is how you can do things at less than or even more than 100%, and to what degree you can do this. Animals cope with varying food supplies by storing food that is not needed now as body fat (which can also double up as insulation) or slowing down their metabolic rate, such as by hibernating. In the same way, we can use partial, overdone or excessive action to solve problems that seem impossible at first glance. By thinking creatively and applying the principles of TRIZ, we can often find surprisingly simple solutions to complex problems.