4B [Scope of Convention (issues excluded): "the CISG itself does not regulate procedural law questions"];

25B [Definition of fundamental breach: substantial deprivation of expectation, etc.];

35A [Conformity of goods: quality, quantity and description required by contract];

39A11 [Buyer must notify seller of lack of conformity (degree of specificity required): "for the purpose of describing the nature or type of the non-conformity within the meaning of Art. 39(1) CISG, it is sufficient if the buyer communicates that the machine is not functional; he is not required to also describe the causes of the functional disturbances];

49A [Buyer's right to avoid contract: notice issues];

74A [General rules for measuring damages: loss suffered as consequence of breach];

81C1 [Effect of avoidance on obligations (obligations of parties): restitution by each party of benefits received (return of defective goods)]