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.
A 529 plan is a college savings account that's exempt from federal taxes. The plans were introduced in 1996 to help taxpayers salt away college expenses for a designated beneficiary. These plans, named for Section 529 of the federal tax code, often have tax benefits at the state level for in-state residents.