Final answer:
The answer choice that is NOT a source of expert judgment is D. Critical chain.
Step-by-step explanation:
Expert judgment refers to the insights and opinions provided by individuals or groups with specialized knowledge or training. Consultants (option A), industry groups (option B), and professional associations (option C) are all potential sources of expert judgment that can provide valuable input in the development of a project charter. However, critical chain (option D) is not a source of expert judgment.
Critical chain is a project management technique that focuses on analyzing and managing project constraints to improve project performance. While critical chain experts may have specialized knowledge in project management, their expertise is not typically sought to assess inputs in developing a project charter.