Project networks can contain activities of the following type:
Using internally processed activities you determine the amount of
Work produced by machines or persons, and use this information in resource planning to plan the capacity requirement.
Using
external processing you determine which services are required from other companies to carry out the project. The development of external processing occurs through purchasing.
Using
External Services Management you plan unplanned and planned services for carrying out the project. The development of external services management occurs through purchasing.
Using general costs activity you plan primary costs, for example, travel costs.
Activity Types 
