We used a Fuzzy Inference System (Mamdani-based) for performance enhancement of a meta-heuristic algorithm. We set ranges 0-20, 20-40, 40-60, 60-80, 80-10 for absolute Low, Partial Low and Medium, absolute Medium, Partial Medium and High, and absolute High, respectively. How such selections can be justified.
Note: Our results are very strong on these ranges.