In which of the following contract types is it easier to change the scope of the contract?

The process of change will be same in all contracts. However if you wish to increase the scope, response will be

Option - E (Vendor will easily agree to change the scope as he can make more economic gains)

However, it would be better to cancel the contract and sign another contract if there is decrease in scope.

My opinion is that the right answer is:

E. cost plus percentage of cos

Option-E  is appropriate choice.

Thanks for invitation -

With the choice 5- E .

it is easy to change contract scope if it is beneficial to the contractor (flexible contracts )

E. cost plus percentage of cost is teh answer....

Thanks