Modelling refers to the demonstration of a behaviour so that it may be learnt vicariously by the client.

See also:
"Modelling" is in the CPC Code "3544"
  Modelling pastes; "dental wax" or "dental impression compounds"; other preparations for use in dentistry with a basis of plaster; preparations and charges for fire-extinguishers; charged fire-extinguishing grenades; prepared culture media for development of micro-organisms; composite diagnostic or laboratory reagents n.e.c.

"Modelling" is in the HS Code "3407"
  Modelling Pastes, Including Those Put Up For Children`S Amusement; Preparations Known As Dental Wax

Other /More definition:
Modelling refers to the demonstration of a behaviour so that it may be learnt vicariously by the client.
List of books: Modelling

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