What Is The Fundamental Set Of Assumptions, Values, And Ways Of Doing Things That Has Been Accepted By Most Of A Company's Members Called?

The fundamental set of assumptions, values and ways of doing things that has been accepted most of a company's members is 'strategy'. It's the source code around which a firm's are built, the very foundation and the stepping stone. The most successful companies build around that foundation and encourage their employees to brainstorm and keep updating the company's strategy through debate and discourse.