(i)     Classical conditioning involves stimulus-stimulus substitution whereas operant conditioning is S-R conditioning where S is made contingent on R 
(ii)     Classical conditioning is related to psycho-somatic behaviour while operant conditioning deals with reflexes. 
  (iii)     In classical conditioning reinforcement precedes a response while in operant conditioning it follows a response.
   (iv)     Subject is relatively active in classical conditioning whereas it is a passive responder in operant conditioning.
    (v)     The association between two stimuli is a critical factor in learning through classical conditioning while the response and reinforcement contingency is important for learning in operant conditioning.
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