Traditional mass media reaches many people simultaneously. However, mass media reaches most people only once and only if they are tuned in. Repetition tends to become very expensive unless it's a short public service announcement. Fortunately, mass media productions or other messages can be made into a tape for later replay at home or in meetings. However, they usually become dated since the material cannot easily be altered.
Newspaper articles capture timely events and reach many people.
However, fewer people read newspapers today than in previous decades. Slide presentations are flexible and can easily be modified to include new weeds or information, and status updates. However, effective presentations require a knowledgeable presenter. Newsletters can target a specific audience, but they require an investment in maintenance of the mailing list and production of the newsletter. Other publications such as bulletins and fact sheets tend to be more durable than newsletters.