The label homo sapiens by which humankind is designated translates into “the knowing person,” hinting at the essential importance for human affairs of knowledge and its construction. As individuals we form new knowledge constantly and continually. To carry out even the most mundane activities we need to know a variety of things. Before embarking on a bit of intelligible behavior, no matter how small, we need to orientate ourselves in time and space, decide what our implementation intentions are for that particular instant, divine their feasibility under the circumstances, and so on. All these are types of knowledge that individuals need to formulate on a moment-to-moment basis.