Actually,it is not easy to explain 義理 and 人情. That's why no one will try answering your question. 義理... To make good comunication with others,you have to obey rules,customs and laws.Sometimes you have to say "yes" toward what you want to refuse.You couldn't oppose common sense,because others criticise you. In this case,"Honesty,I want to say NO!" is 本音（= true intension. You couldn't express real intension because you are afraid that the others criticise you when you say "No".) 建て前... People always care how others criticise them. Because people want to get good estimate,people imitate themself by hinding true intension. 人情... Basically, people is so gentle that they can't neglect others truble. Naturally,people can't stop helping others. 根回し... To negotiate successfully,you can use various ways. They are not only discassion but entertainment or makeing others welcome. But if you do these things openly,your enemies or rivals will prevent you from aproaching the others.That why you need to do them secretly.

I couldn't find 人情 wiki

and 根回し wiki page http://en.wikipedia.org/wiki/Nemawashi

本音と建て前 wiki page http://en.wikipedia.org/wiki/Honne_and_tatemae

http://en.wikipedia.org/wiki/Giri_(Japanese)