A procedure mask is used for performing patient procedures, or when patients are in isolation to protect them from potential contaminants. They are used for 'respiratory etiquette' to prevent people from spreading germs via talking, coughing, or sneezing.
Rolling-wave planning is the process of project planning in waves as the project proceeds and later details become clearer; similar to the techniques used in agile software development approaches like Scrum.. Work to be done in the near term is based on high-level assumptions; also, high-level milestones are set.
The project plan is actually a collection of documents, which defines how your project will be executed, monitored and controlled and closed. Spread the word! A project plan is one document that consists of a number of subsidiary plans. If your project plan was a book, the subsidiary plans would each be a chapter. By combining all subsidiary plans into the one and only project plan for the project, you and your team will have a centralized place to find all project-specific information.