There are three main types of Key Performance Indicators $($KPI$\text{'}$s$),$ including

a$)$ Process KPI's, Input KPI's. Output KPI's

b$)$ Register KPI's, Performance KPI's, Output KPI's

c$)$ Performance KPI's, Process KPI's, Management KPI's

d$)$ Performance KPI's, Input KPI's. Output KPI's

e$)$ Process KPI's, Input KPI's. Management KPI's