All activities that are planned need to fit into a time frame as timings, and regularity are essential for continuity, and greatly determine the children's feelings of security, the achievement of goals, and the effectiveness in providing the activities. However, there are instances when opportunities arise, even when not specifically planned, which can be used as learning experience for children. For example, if there is a circus visiting your town, children could develop an entire project around that theme, or if there is an earthquake or war situation, it can be used as a teaching learning situation where discussions could revolve around how can one predict an earthquake, or what kinds of preparations need to be made during such crisis, etc. A good schedule usually takes into account the needs of the children and the teacher.