In step 3 the controlling part of the experiment is defined. 21st Century Project uses the concept of data flow, which allows you to design an online evaluation as with an analog computer. Dividing the special source time by the import parameter A (experiment time) you get a linear increase from 0 to 1 controlling the Y movement. This value is exported as point 1. A logical comparison detects the end of the experiment and an adequate definition calculates the X movement to scan B lines. This second value with the range from 0 to 1 is exported as point 2.