The main similarity between these two is that they are both hierarchically structured. Abraham Maslow's hierarchy of needs arranges human needs in a pyramid. At the bottom are things like food and sex, and the hierarchy of needs rises through needs related to human safety, social needs, and finally the need for "self-actualization," or fulfillment. One has to be able to satisfy the more basic needs before satisfying the higher needs. Bloom's taxonomy is also imagined as a pyramid, with "knowledge" like rote memory at the bottom, and evaluation at the top. (The "new," or "revised" taxonomy places "remembering at the bottom and "creating" at the top.) Both the original and revised Bloom's taxonomy rise from basic knowledge through more sophisticated levels of cognition. In a way analogous to Maslow's understanding of needs, Bloom thought lower-level thinking skills were the foundation for higher-order skills. So while both created a hierarchical model for human development, they were talking about two different things. Maslow's model was about the satisfaction of needs, Bloom's about thinking skills.