What is the order analytical method fundamental to ? I know two of them are taxonomy, biochemistry. I need to know the third one.

Since this is not my area of expertise, I searched Google under the key words "order analytical method" to get these possible sources:

http://charlakeiser.com/portfolio/writingsamples/genecon.html
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4016893
http://etd.library.vanderbilt.edu/ETD-db/available/etd-11302004-144603/

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.

I hope this helps. Thanks for asking.