A self-tuning hierarchical controller in which a Fuzzy logic controller supervises the control actions of a conventional PID has been proposed. implemented and presented in this paper. The controller has been applied to a control study of Fluid Catalytic Cracking unit (FCCU) riser temperature. and regenerator temperature respectively. https://www.bekindtopets.com/mega-super-2-Button-Hand-Control-for-the-Mega-Motion-Lift-Chairs-ELEASMB7120027-save-more/