Lesson 1: Systems Thinking
A system is a set of parts that work together to do something. Engineers think in systems — understanding inputs, outputs, and how components interact is the key skill that separates good engineers from great ones.
Key Concepts
Inputs and Outputs
Every system takes inputs and produces outputs. A car engine takes fuel and air (inputs) and produces motion and heat (outputs). Understanding inputs and outputs is the first step to understanding any system.
Feedback and Control
A thermostat is a system: it measures temperature (input), compares it to the target, and controls the heater (output). The output feeds back into the input — this is a feedback loop. Almost every control system uses feedback.
Emergent Behavior
Sometimes a system behaves in ways none of its parts do individually. Traffic jams emerge from individual driving decisions. The internet emerges from millions of connected computers. This is called emergent behavior and it is one of the most fascinating topics in engineering and science.
🆕 System Diagram Builder
Click a system to see its input/output diagram.
✅ Check Your Understanding
1. What is a system?
2. What is a feedback loop?
3. What is emergent behavior?