I have a question about communication channels that is talking about person-month but I don't understand what is a person-month. Does it mean this many persons? or this many months?
Here is the full context:
Based on statistical data in a company, communication path between two persons consumes 5% of each person’s time (during a 8-hour work day). For a project that requires 12 persons-months of development time, how many people will be needed to finish the project in four-months if (a) the democratic team structure is used and (b) the chief-programmer team structure is used. If the team consists of four persons, what is the difference in the completion time for a team using the democratic structure and a team using the chief-programmer structure?