Tribal knowledge is information or knowledge that is known within a tribe but often unknown outside of it. A tribe, in this sense, may be a group or subgroup of people that share such a common knowledge. From a corporate perspective, "Tribal Knowledge or know-how is the collective wisdom of the organization. It is the sum of all the knowledge and capabilities of all the people".

经常听人说这个词所以留意了一下。翻译成部落知识肯定是不对的。我觉得它的意思接近 secret sauce， know how。也许翻译成经验或者诀窍比较贴切？