Stakeholders, the essence of project! Their attitude, actions, and reactions contribute to the success of a project.
As any person, they behave differently based on their position (function, culture, situation, values, interests, etc…) and perception of facts/information. These factors motivate or discourage a person from sharing information and make them sometimes to share easily while barely in another situation.
If a person is in a good position, feeling secure and confidence, achieving on time, sharing information will be such a smooth process. However, if he is in different conditions, he may resist sharing information. Sometimes, he resists sharing information when he does not understand its importance or impacts or if it is a negative information, to protect his coworkers and to keep them motivated.
You can never judge a person without understanding his position and perception of information.
It is never a rule or a fact that a person does not share or resist sharing information.
It is about the situation, attitude, and reaction in certain circumstances.
Therefore, establishing a good communication process to share information is challenging when it comes to managing a project. These activities should never be left to chance and managed as per the person's temper, perception, and position. It should be normalized and structured. It is up to the PMO and Project Manager to decide what type of information is needed and is considered as output/input for activities/phases and to setup the structure that encourages stakeholders to share this information.