Final answer:
Project managers should not limit observer selection solely to those they want to share information with; rather, engaging a diverse group of stakeholders offers valuable, potentially challenging perspectives that can benefit the project.
Step-by-step explanation:
Engaging a variety of stakeholders and ensuring they have bought into the project and understand the project plan is critical. This engagement allows for valuable feedback that can shape project outcomes positively. By inviting different observers and stakeholders to provide insights, project managers can avoid an information echo chamber and access a richer array of input for project evaluation and implementation. Project managers need to consider not just what they want to share, but also what insights they wish to gain from the observers who can potentially contribute to the project's success through diverse views and knowledge.
Moreover, building trust and maintaining transparent communication with team members and stakeholders is vital. Being selective about participation and information sharing does not mean limiting access strictly to those with aligned interests but rather fostering an environment of diverse perspectives that contribute to the project's overall effectiveness and sustainability.