Pyramid of Users' Needs - Aarron Walter, the author of Designing for Emotion, used a Maslow’s hierarchy of needs to create the pyramid of user needs. At the bottom of this pyramid, you can see the baseline characteristic of any product — functionality (does this product work?). Next comes reliability (is this product reliable?), usability (is this product easy to use?), and, finally, pleasurability (does this product makes us feel good when we use it?). Pleasurable products connect with users on an emotional level, and this feature makes them want to use it more and more.