MODEL OF LEADER IN GENERAL (Rizko's model)
This model is made after detail considering appearance positive leader under negative leader as their later movement. This model is advisable for configurations where the voltage of corona appearance smaller than voltage of positive leader appearance. That is the cause that he finds use in considering chances above overground lines. The final expressions for calculation of radius of attraction are:

where Rac is radius of attraction for horizontal lines, h is height of line above ground, I is lightning current and Rat (I, 40) is radius of attraction for pylons height 40 meters. In formulas we need to insert currents in kiloampers and height and radius in meters.

MODEL OF LEADER MOVEMENT
In creation of this model, beginning was at the determining of resultant electric field in negative leader to simulate the charge in cloud. Result is model that doesn't have a formula for radius of attraction but he has maximal horizontal distance (LD) and maximal protective distance on the ground level (PDg).
Using this model we can see series of relations for LD and PDg and different structures of dimensions even on the different configurations of field.