Determining Cell Boundaries
In DCE, the boundaries of a cell are equivalent to the boundaries of the cell namespace. A small organization can consist of one cell. A large organization can have many cells. The primary factors in determining a cell's boundaries are the common purpose and trust shared by the cell's principals. Principals within a cell can belong to groups that share the same privileges. Members of a group share the same level of trust and are authorized to perform certain actions.
Because there is a set of administrative tasks associated with setting up and maintaining each cell, it is reasonable to keep the number of cells in your organization to a minimum. However, the level of trust shared by groups of principals is a more important consideration than administrative overhead.