The Secret behind ranking of B schools!

Hello Friends!!
It is really very drustating to see ISB one year in the top 20 ranking and the other year out of it. Same is the case with few asian schools such as NUS, Hongkong B school and CEIBS,(though Ceibs has been able to sustain itself more regularly)
The whole concept of various ranking system varies !!
FT Rankings - these are ranking based on crude statistical analysis with quantification of every aspect of data being presented fom B schools. The buggest flaw is its superficial nature. You may find it comprehensive but over all its highly dependent on the data provided by B schools such as Salary (median / average) placements and other variables not taking into account various other factors which also lead to the reputation of a school such as intake variety , the salary components, International exposure in the MBA course and varios other factors which are student driven rather than alone data from B school driven
Other rankings such us and news ranking or over all economist rankings are more so qualitative with not upto the mark quantitative and statistical analysis. Over all it does give some hope in trying to achieve a particular number agreed upon from majority,
But the rankings provided are also biased.
Also other factors such as base salary offered in intl schools vs. ISB quoting its ctc packages which is again not base salary.

Thus most of Rankings are skewed one way or other.
My best bet would be to start with a simple format why you want to do an MBA and how you see yourself in next 10 years . These may be your dreams but for deciding it would be good to use FT ranking with other rankings and create a common ranking standards to provide adequate confidence in the candidate!!