Engineers design systems composed of simple components in order to ensure modularity. Modularity of system is huge advantage for its use. Sensor of input signal can be replaced to measure different quantity. Same procedure can be done with almost every component. Diploid IODs arise of two haploids. Thus, their user can conduct many different combinations of sensors (receptors) and output signals (pheromones or yeast display). Another modularity is ensured by communication among all IODs.

One of the main goal of cybernetic is to describe system, control it and be able to know reaction of this system on a concrete input signal. This reaction may be in form of output signal that can be measured and can influence another system. IODs are excellent example of such system. Pheromone represents input signal and output signals are yeast display and another pheromone which is an input signal for another IOD system.

Engineers often use graphical block diagramming tools to make functionality of system transparent. Block models simplify work on system description. It is not necessary to describe a system with difficult differential equations and recurrence relations. We used these diagrams for graphical representation of IODs. This approach made our project more clear to engineers non-biologists.