Adding Resources to Activity Graph
Each activity is labeled with resources, e.g.,
   Number of people (e.g., 2 Java programmers)
   Key personnel (e.g., chief system architect)
   Equipment (e.g., 3 servers with specified software)
   Facilities (e.g., video conference center)
Each resource is labeled with availability, e.g.,
   Hiring and training
   Vacations
   Equipment availability

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