Abstract
In most challenging decision problems, relevant parameters are changing. Decision blinds, decision traps, and fuzziness, would unavoidably occur in the process of dealing with this kind of problems. To make effective decisions, it is important to be aware of the existence and changing nature of the potential parameters. In this article we first discuss a main cause of fuzziness and unknowns in decision making, and then introduce the relevant parameters including those in human behavioral systems and in decision processes. The concepts of habitual domains, decision blinds and decision traps are explored. The tools of habitual domains are proposed to enable decision makers to more effectively expand and enrich their visions and perceptions on the problems as to reduce decision blinds and fuzziness, and avoid decision traps. Consequentially, effective solutions for decision making in changeable spaces can be located.