| 1P | One Pulse, response with 2 monotonic segments (1 extreme point) |
| ADRC | Active Disturbance Rejection Control |
| ART | Average Residence Time |
| DC | Direct Current |
| IAE | Integral Absolute Error |
| IPDT | Integrator Plus Dead-Time |
| IOSSCH | Input-Output Steady-State Characteristic |
| MRDP | Multiple Real Dominant Pole |
| PID | Proportional-Integrative-Derivative |
| QRDP | Quadruple Real Dominant Pole |
| TV | Total Variation |
| TV | Deviation from monotonicity (0P shape) |
| TV | Deviation from 1P shape |
| TRDP | Triple Real Dominant Pole |