What is the source of the concept - Banch Mark?

If you meant bench mark then here is the answer:

The term benchmark originates from the chiseled horizontal marks that surveyors made into which an angle-iron could be placed to bracket (bench) a levelling rod, thus ensuring that the levelling rod can be accurately repositioned in the same place in the future. These marks were usually highlighted with a chiseled arrow below the horizontal line.

http://en.wikipedia.org/wiki/Benchmark_%28surveying%29

I think your answer is irrelevant, when you look at the tags riki gave the question.

Can you give more details, riki? your question is not very clear. 

On the contrary, I believe yoavdothan's answer is exactly correct, since riky asked for the source of the term benchmark.

A benchmark is, effectively, a standard.  In business usage a benchmark is a quantitative comparison of some aspect of business performance against other companies.  You might, for example, benchmark your revenue-per-employee against the same measure for other companies in your industry to see if your business was either more or less efficient than the other companies.

Benchmarks are used for comparison, and the origin of the term goes back to the source cited by yoavdothan. 

Thanks for the support...

There was no tag that I could find in the question even that I reread it that could mean anything else