The systems approach
The systems approach (also called systems thinking) means studying how different parts of a system are connected and interact, rather than looking at parts on their own.
In ESS, this helps us understand complex environmental and social issues by looking at the whole picture.
Key terms
- Systems approach
- A method of studying how different parts of a system are connected and interact, rather than examining parts in isolation.
- Systems thinking
- An alternative name for the systems approach, focusing on connections and interactions within systems.
- System
- A group of parts that work together to form a whole, with components, connections, functions, and emergent properties.
- Emergent properties
- Characteristics that appear only when parts of a system interact, not existing in individual parts alone.
What is a system?
A system is a group of parts that work together to form a whole.
All systems:
- have parts (components)
- have connections between those parts
- have a function or purpose
- show emergent properties
Emergent properties
Emergent properties are characteristics that appear only when parts interact. They do not exist in the parts on their own.
Examples:
- Predator–prey cycles — population patterns appear only when species interact
- Bird murmuration — individual birds follow simple rules, but together create complex movement
Always link emergence to interaction between parts.
Systems at different scales
Systems exist at many scales:
- small scale — a pond ecosystem
- medium scale — a rainforest
- large scale — the Earth system
The systems approach can be used at any scale.