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.
Project Management Subsidiary Plans. A Project Management Plan is a formal, approved document that defines how the project is executed, monitored and controlled (PMBOK Guide 4 th Edition). It can either be at a summary level or detailed and maybe composed of one or more of subsidiary plans depending on the requirements of the project.