66 TEACHING SCIENCE IN SECONDARY SCHOOLS

presentation, and utilize the many divergent outgrowths fol-
lowing its use. In many schools the leadership in film use may
fall to the science teacher because his training makes him the
logical person to help in the selection of equipment and the
training of projectionists.
 Suggestions for planning the effective use of films.
 A. Prepare yourself.


1. Know the purpose of the film.
2. Read catalogs and study the guides.
3. Become familiar with it well in advance, by preview.
 Do not use any film that is unsuitable.
4. Consult your file of films previously used (see be-
 low).
5. Cooperate with the central distribution bureau of
 your school.


B. Prepare the class.
 1. Explain the purpose of the film.
 2. Call attention to scenes that should be noticed with
 special care.
 3. Explain and define any unfamiliar technical termin-
 ology.
 4. Tell the class to be on the alert for activities sug-
 gested by the film.
C. Present the film.
 1. Ideal length of showing is 10 to 15 minutes of a
 period, to allow time beforehand for introduction,
 and afterwards for discussion, representation, and
 followup.
 2. Encourage informal class questions and discussion
 immediately after film.
 D. Follow-up.
 1. Have exhibits, experiments, or reports suggested by
 the film.
 2. Evaluate learning by a suitable check-up.