is the duplication of critical components of a system with the intention of increasing reliability of the system
. In safety-critical systems, such as fly-by-wire aircraft
, some parts of the control system may be triplicated. An error in one component then may then be out-voted by the other two. See safety engineering
In information theory
is the number of bits used to transmit a message minus the number of bits of actual information in the message. Data compression
is a way to eliminate such redundancy.
In employment law
is the dismissal of an employee
when his or her job becomes unnecessary. UK
redundancy law allows three reasons for redundancy:
- Total cessation of the employer's business (whether permanently or temporarily)
- Cessation of business at the employee's workplace
- Reduction in the number of workers required to do a particular job.
The law requires the employer to make a statutory redundancy payment, which is tax
-free and is based on the employee's length of service, as long as the employee has served a minimum of two years. The employee is not allowed to claim redundancy if he or she was offered an alternative position with similar salary, status and responsibilities.