Performance Rating factors are based on "Inequality"
Zonal bifurcation is based upon Locations.
Some locations are naturally abundant in 'Customers' and business is good, and result is continuously progress.
whereas some zones are deprived of 'customer base' and absence of business deprives them of showing their performances...
Rest...
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of things like accidents, punctuality, safety security, involvement in local issues too is affected by various factors like 'Seasonal favors' like flood, storm fog, rains , land slides ....
If IR declares the criterion upon which zonal performance is judged , people will know who is playing 'Game"
in this context, I remember my previous employer. where all departments will be rated for 'Safety' and rating done. The Production department had made it a point not to lose the no.1 position.
I was member of committee which inspected various safety aspects. as a team we will visit the plant, and I noticed that production people were violating safety norms such as not wearing safety gloves, shoes, and masks for breathing.
I asked why is it so?
They replied 'you are coming first time. and this will be your last time. after that my report was changed by chief of the committee to suit the 'requirement'
So this is how all entities are running a show ...

A lot of compromise is often made in reporting so as to suit the statutory requirements and also to fulfil vested interests on many occasions. If all the norms regarding safety and environmental pollution is strictly applied to all the factories in our nation, more than half have to close down. Had your report not been changed, it would have been buried and had never allowed to move further for consideration/ implementation.
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A list of 16 or 17 parameters/ criteria was declared by ministry of Rlys to judge the annual performance of...
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Zonal heads which shall be basis for their further promotion (and not the performance of Zones as is widely being reported and believed). It is actually the % fulfilment of the targets given by the ministry to various zonal heads and not the absolute measurement of performance of particular zone. There is possibility of favour being to a particular zonal head by setting easier targets so that the same performance shall fetch much better rating than actually deserved.