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NIA may, at any time, make any change, by written order, in the form, quality or quantity of the Works or any part thereof that in the opinion of NIA may be necessary or desirable and Contractor shall be bound by such written order to do any of the following:

a) increase or decrease the quantity of any work included in the Contract;
b) omit any such work;
c) change the character or quality of such work;
d) change the levels, lines, position and dimensions of any of the works, and
e) execute additional work of any kind necessary for the completion of the works.

No such change shall in any way invalidate the Contract but the value (If any) of all such changes shall be taken into account in accordance with Article GC-16, ADDITIONAL WORK.