- In mechanics,
**stability**characterizes the result of small perturbations to a system in mechanical equilibrium. - In system analysis and signal processing,
**stability**means either:- BIBO (Bounded Input, Bounded Output) stability
- Lyapunov stability

- In control theory,
**stability**characterizes the reaction of a dynamic system to external influences. - In numerical analysis,
**stability**refers to how well an algorithm performs with regard to error in the numerical results: see numerical stability. - In everyday conversation about computers,
**stability**refers to the tendency or otherwise of a system or program to crash.