What is design?
Definition
Intentional transformation of constraints into functioning systems that solve a defined problem for a defined user under limited resources.
Input Variables
- Goal
- User needs
- Constraints (time, cost, physics, cognition)
- Context
- Materials
- Technology
Core Operation
Mapping requirements → structure → behavior → outcome.
Primary Function
Reduce entropy (confusion, friction, waste) and increase utility.
Evaluation Metrics
- Effectiveness
- Efficiency
- Usability
- Reliability
- Scalability
- Aesthetics (signal clarity)
Not Art
Art optimizes expression; design optimizes performance.
Not Decoration
Visuals are interfaces, not goals.
Universality
Exists in products, software, systems, policies, biology, cities.
Failure Condition
When outcomes diverge from goals under real constraints.
Formula
Design quality is higher when a system produces more useful outcomes while minimizing cost, cognitive load, and risk.
Design is applied problem-solving that engineers reality to work as intended.