A novel multivariable laboratory process that consists of four interconnected water tanks is presented. The linearized dynamics of the system have a multivariable zero that is possible to move along the real axis by changing a valve. The zero can be placed in both the lefr and the right half-plane. I n this way the quadrupletank process is ideal for illustrating many concepts in multivariable control, particularly performance limitations due to multivariable right halfplane zeros. Accurate models are derived from both physical and experimental data and multi-loop control is illustrated.