You are the project manager at a large investment bank. Your current project involves developing a creative financing solution for a large bio-tech company in order to facilitate the acquisition of another company. Specifically, your project involves issuing convertible debt securities in order to access a new pool of low-cost capital. This transaction is the largest ever convertible transaction in the bio-tech company. Unfortunately, your project is plagued by frequent changes to project charter. Who should be primary person responsible for deciding whether the changes to the project charter are necessary?