Overlay transparencies allow teachers to control the pace of presentations in front of large classroom groups using simple, inexpensive materials. While transparencies provide advantages like ease of use and teacher visibility, they also have limitations such as requiring electricity, equipment for projection, and preparation of only transparent materials.

1. Overlay
Transparencies

7. ADVANTAGES:
 It is simple to operate.
 Therate of presentation can be
controlled by the teacher.
 Itis usually placed in front of the
classroom, therefore the teacher can
still face his/her students.

8.  It can be used in a large groups.
 Transparenciescan be prepared
through a variety of
simple, inexpensive methods.
 It is effective in a well-lighted room.

9. LIMITATIONS:
 It
requires electricity and special
equipment.
 OHPs are heavy and bulky to
transport.
 Framed transparencies are bulky and
difficult to store.

10.  It is instructor dependent.
 It
requires preparation since
nontransparent material cannot be
projected.