BASED ON STRUCTURE
(1) Physical Models: These models give a physical appearance of real object in reduced or scaled up form .These are further divided into two categories:
a) Iconic Models: Physical or Pictorial representaion of the various aspects of the system. Ex. Blue Prints, Globe, Templates etc.
b) Analogue Models:These models represent a system by a set of proerties different from the original system. Ex. .Ex: A network of water pipes to show flow of current in electrical network. Level Indicator in a automobile petrol tank