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psychlotron.org.uk
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Name of resource: Piaget 5: preoperational thinking
Author(s): Aidan Sammons & Paul Cline
Specification: AQA-B
Details: Slides on preoperational thinking, with focus on failure to conserve.  Embedded 
activities: 

1) Have conservation test equipment and instructions dotted about the room and let 
the students try them out.
2) After discussing possible problems with the validity of the tests let the students
have a go at redesigning them.  I allow them to use anything in the room including
a box of toys/props etc.  After they've all have a while to think about it choose
a couple to demo their improved tests and ask the class to assess whether the new
version is more valid than the standard Piagetian task.
3) Finish with a demo of some of the classic 'improved' versions (e.g. conservation
of number with 'naughty teddy').