The purpose of the Core Group is to establish the Bible Study and serve as a solidifying unity so that no-one can overthrow the Bible Study or turn it in a direction that is not in agreement with the vision statement of the Bible Study. Determine a Program Find a program that is Bible-based and not denominationally limiting. Foundational material such as those by Campus Crusade for Christ are an excellent example. I once didn't bring the material by accident, and thus improvised. The Lord blessed that study very well.
People can grow upset if there is no sense of continuity.
The feeling and sense of graduating is important for all of us. If you don't follow this guideline, you are setting yourself to be vulnerable of being overthrown or the Bible Study going in a different direction than you are capable of managing. Your ability to maintain order is paramount. Let's say you have a core group of four people. Then invite three guests.