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.
Plan number two is kept changing as per the requirements of the Indian economy. The Third Plan is a perspective plan which is for long terms i.e. for 10, 15 or 20 years. Hence there is no fixation of dates in for the commencement and termination of the plan in the rolling plans. The main advantage of the rolling plans is that they are flexible and are able to overcome the rigidity of fixed five year plans by mending targets, the object of the exercise, projections and allocations as per the changing conditions in the countryâs economy.