This presentation shows in brief the Quasi- Contracts from Indian Contracts Act,1872

2.  It is an obligation, which the law creates in the
absence of the agreement.
 It can be described as, “certain contracts
resembling those created by the contract.”
 Its is based on the maxim, “nomo debet
locuplatari ex liena justua.”

12.  Literally means, “as much as earned” or “as much as
merited”
 The party can claim remuneration when the party
when it has completed his part of the duties & the
other party repudiates the contract or due to some
event the performance of contract becomes impossible.
 The right to claim quantum merit does not arise out of
control as the right damages does; it is a claim on quasi
contractual obligation which the law implies in
circumstances

13.  When an agreement is discovered to be void.
(Section 65)
 When something is done without any intention to do
so gratuitously (Section 70).
 When there is an express or implied contract to render
services but there is no agreement as to remuneration.
 When the completion of the contract has been
prevented by the act of the other party to the contract.
 When a contract is divisible.
 When an indivisible contract is completely performed
but badly.