The document discusses design from the perspectives of engineers and interaction designers. For engineers, the design process considers F3 - form, fit, and function. However, designers sometimes overly focus on F3 and lose sight of other essentials like finish and meaning that mainly concern users. The most important element for interaction design is meaning, as designers are creating for humans, not machines, and users make sense of designs based on meaning. Designers are reminded to always include finish and meaning alongside F3 in their designs.