" The two basic managerial roles produce two basic kinds of meetings. In the first kind of meeting, called a process-oriented meeting, knowledge is shared and information is exchanged. Such meetings take place on a regularly scheduled basis. The purpose of the second kind of meeting is to solve a specific problem. Meetings of this sort, called mission-oriented, frequently produce a decision. They are ad hoc affairs, not scheduled long in advance, because they usually can’t be. "

― Andrew S. Grove , High Output Management