How one develops common sense is an abstract question. Even with all my research, theres still more to learn. Ive seen theories, philosophies, and find very interesting reads from time to time (organicmd.org) I came across a book (Wikipedia) called "Common Sense", which was written by Thomas Paine during our revolution (U.S history ). This books "common sensible" argument existed to persuade the loyalist's to be patriots and join the revolution for obvious reasons. Putting the situation in rhetoric, Thomas Paine harnessed the art of reasoning to perform such persuasion, and gain support for the revolutionary war.
Reasons such as taxation without representation made British colonist's say things like "give me liberty or give me death." At the time ( 1770's), it was common sense that the king wasn't treating the colonist like British citizens, thus revolution was inevitable. And due to the lack of representation that the colonist's had, they lost love for their mother country. "Common Sense" was based on Thomas Paines' common sensible reality, and forced people to choose to believe, or argue against. Common sense is mutual in a sense, because it's to be shared by most people, and Paine used that to his advantage. He forced people to adopt his reasoning as thier own through literature. The example amplifying that argument is the road to revolution period in the America's.
That particular time period was a time of protest in which many colonist's shared the same views, and held the same knowledge, and knew that certain issues needed clarification. Issues such as representation in Parliment, taxes and high tariff's, strict trade policies, etc! Thomas Paine wrote the book to explain to colonist's what the common sense was at the time, and used his logic to back his reasoning, in which made the common sense he expressed trustworthy because it was logical to agree with, unlike the kings high tax policies, and quartering (station a soldier in a citizens house). And thats how common sense becomes mutual. The same way a boss mutually understands' his workers capabilities, and talents. You common sensibly send the right man for the job... Common sense is simply developed through your reasoning of an issue.
http://ontology.buffalo.edu/smith/articles/Ontology_of_Common_Sense.pdf
"Thomas Paine."http://en.wikipedia.org/wiki/Thomas_Paine. Common Sense. 1770s
http://en.wikipedia.org/wiki/Common_sense