Thoughts drive emotions, and emotions drive thoughts.
Declarative memory is recalling factual information procedural memory is, as it sounds, recalling the activities to perform a specific action. The reason we don’t understand ourselves is because most thought is subconscious, and therefore hidden from awareness, or reflective, conscious thought. Without a deep understanding of people and human behavior, good design is nearly impossible. 
Seven stages of action: goal, plan, specify, perform, perceive, interpret, compare.Every action has two parts: doing and interpreting.Technology is paradoxical: more functionality helps simplify life while making it harder to learn and use.A conceptual model, or mental model, is a simplified version of how something works.For example, with scissors the holes are both affordances that allow the fingers to be inserted and signifiers that communicate where the fingers should go.Signifiers let the user know how to use the design and are therefore more important than affordances.
Affordances determine what actions are possible. Great design should be pleasurable for the end user. Machines should meet people where they are rather than forcing people to adapt to machines. Design is about how things work and are controlled, and the interaction between people and products. Industrial design emphasizes form and material interactive design emphasizes understandability and usability experience design emphasizes emotional impact. Good design starts with discoverability and understanding. Incremental innovation is common, but radical innovation is uncommon. Design based on human psychology, cognition, emotion, action, and interaction will remain relevant for the foreseeable future because humans don’t change. 
Good design is less noticeable than bad design. My summaries are casual and include what I believe are the most important concepts, ideas and insights from the book, along with direct quotes from the author. 
This is my book summary of The Design of Everyday Things by Don Norman. Good designers understand the interplay between technology and psychology, or human-centered design (HCD). Poor design usually results from not understanding how people interact with products. Many products don’t work well due to faulty design, not operator error.
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