# Wiki Sandbox

- Complexity is determined by activity
- If a system has complicated internal components, but they're hidden behind well-designed interfaces and rarely need to be modified, then the system is not complex
- Complexity can be thought of as
- → Overall complexity
- → complexity of each part
- → fraction of time spent working on part

- Complexity is determined by activity
- If a system has complicated internal components, but they're hidden behind well-designed interfaces and rarely need to be modified, then the system is not complex
- Complexity can be thought of as {$ C = \sum_p c_p t_p $}
- {$ C $} → Overall complexity
- {$ c_p $} → complexity of each part {$ p $}
- {$ t_p $} → fraction of time spent working on part {$ p $}