Convenience

This is common sense. If you don't think ahead about the surroundings in which you will pursue IC, you may find yourself holding a document up on the wall of a dimly lit hallway so the participant can sign. That really doesn't inspire confidence and trust. Intentionally or by default, environments are chosen, and choices reflect values. It rarely goes unnoticed if an environment demonstrates insensitivity to the prospective research participant's needs and comfort.