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This Article addresses a problem which is peculiar to the right to require performance. The aggrieved party may abandon the remedy of requiring performance of a non-monetary obligation and opt instead for another remedy or remedies.

This choice is permitted on account of the difficulties usually involved in the enforcement of non-monetary obligations. Even if the aggrieved party first decides to invoke its right to require performance, it would not be fair to confine that party to this single option. The non- performing party may subsequently become unable to perform, or its inability may only become evident during the proceedings.

Two situations must be addressed.

In the first case, the aggrieved party has required performance but changes its mind before execution of a judgment in its favour, perhaps because it has discovered the non-performing party's inability to perform. The aggrieved party now wishes to invoke one or more other remedies. Such a voluntary change of remedy can only be admitted if the interests of the non-performing party are duly protected. It may have prepared for performance, invested effort and incurred expense. For this reason paragraph (1) of this Article makes it clear that the aggrieved party is entitled to invoke another remedy only if it has not received performance within a fixed period or otherwise within a reasonable period of time.

How much additional time must be made available to the non- performing party for performance depends upon the difficulty which the performance involves. The non-performing party has the right to perform provided it does so before the expiry of the additional period.

For similar conditions which restrict the right of termination in case of delay in performance, see Article 7.3.2(2).

Paragraph (2) addresses the second and less difficult case in which the aggrieved party has attempted without success to enforce a judicial decision or arbitral award directing the non-performing party to perform. In this situation it is obvious that the aggrieved party may immediately pursue other remedies.

In the event of a subsequent change of remedy the time limit provided for a notice of termination under Article 7.3.2(2) must, of course, be extended accordingly. The reasonable time for giving notice begins to run, in the case of a voluntary change of remedy, after the aggrieved party has or ought to have become aware of the non- performance at the expiry of the additional period of time available to the non-performing party to perform; and in the case of paragraph (2) of this Article, it will begin to run after the aggrieved party has or ought to have become aware of the unenforceability of the decision or award requiring performance.