Effort-Result Model and concept of multisigmoid curve
The distinguishing feature of the biological system in the universe is that they perform one activity or other. This activity leads to results, which can be either negative or positive. The activity is against the inertia in the universe which requires effort. When the intensity of effort in x axis is plotted against the result in y axis, universally, curve follows the sigmoid shape.
The sigmoid graph has 3 segments, say p, q and r. The first segment, p, is the initial phase where the results increase slowly. After it reaches a critical point, (point k, the intra-sigmoid resistant point), with increasing effort the results increase dramatically/ disproportionately in the mid-portion, the segment q. In the third segment, any further increase in effort improves the result marginally, and after a certain point, any increase in effort will not improve the outcome. The phase of resistance is r. (Fig AB1).