The unit is composed of sequential phases that build upon one another. They record their observations, both by writing and drawing. These initial lessons can be used as a baseline from which the teacher can assess student progress. Students then are ready to meet the microscope, which is really just a set of lenses conveniently mounted for easy use. In the third phase, students use the microscope to view inanimate objects.
Much attention is paid to focusing and lighting techniques.
Students begin by observing flat objects, such as microfiche, and newspaper and magazine photographs. They continue with hair from their head, and use it to measure specimens. They grapple with the concept of field of view and try to decide exactly how much of an object they can see under the microscope all at once. They learn through reading about two relevant historical figures, Anton Leeuwenhoek and Robert Hooke. Students also learn to prepare slides of different types to suit different specimens.