Phlegm originates from the lungs. It is different from the mucus that is produced in the nasal passages. A common cause of phlegm is post nasal drip which is a symptom of sinus infections, colds, flu and inhalation of irritants. The diagnosis of the underlying condition could be made from the color of the phlegm.
A flow chart is a type of diagram representing a process using different symbols containing information about steps or a sequence of events. Each of these symbols is linked with arrows to illustrate the flow direction of the process.
In project management terminology, the critical path is the shortest sequence of work that can complete the project. In critical path analysis, a diagram or flowchart is made of all work items, showing which items are dependent on which others. If done properly, this diagram shows where the bottlenecks will be.