formula presented in fig2 reveals the elements and calculations which form the basis of the jhi essentially the formula calculates the percentage deviation of each metric from the industry peer group average and then having taken account of the gap coefficient for a particular metric aggregates all formed values cf complexity factor of a facility based on standard description of its l m the total number of costs metrics the total number of hours business overheads operations maintenance annualized maintenance health safety security amp environment technical support facility specific laboratory inspection planning and scheduling hours u2014 kpis related to hours have the same division as per facility costs emission environment impact units gas flared and vented cf waste total waste by complexity tones cf incidents total number of recordable incidents per million man hours absenteeism total own staff absenteeism of total days availability u2014 number of hours that product movement has been restricted due to unavailability of equipment reliability u2014 it is a sum of unplanned downtime number of hours of unplanned downtime of a system over the total number of hours available and maintenance backlog number of maintenance hours in a system over the total number of maintenance hours available.