In this paper is presented the string definition of distributions. Next, there are defined the elementary distribution step and the composed distributions sign and window. Using this approach, there are defined two complex nonlinear characteristic controllers. The first controller is applied at DC servo drive speed control and the second at water drain process control. The proposed solutions were modeled and validated by Simulation with good results. The distributions based solutions solve the proposed problems in a robust and simple manner and can be easily coded using any software or hardware design languages.