Exercise 1: A university wants to model information about the teaching of courses. A number of staff members may contribute to providing lectures, and one staff member is denoted as the course supervisor. Suggest an initial data model.

Exercise 2: A farmer keeps information about the application of fertilizer (e.g. amount, date) to his crops. His farm is made up of large sections which are divided into fields. Usually an application of fertilizer is applied to an entire section, but occasionally it is to an individual field. How would you model this?