I believe from the point of view of a project manager, it can be the most challenging to work in a matrix organization. This comes from the conflict of everyone having at least two distinctly separate bosses. The project manager would have to coordinate with the staff to not interfere with their departmental obligations. This comes in contrast with a project management organization, where the staff’s primary responsibility is to the project manager, so that the project manager would have to deal with less conflicts of interest.