1 Activity list. The activity list is described in Section 6.1.3.1.
.2 Constraints. Constraints are described in Section 6.1.1.4.
.3 Assumptions. Assumptions are described in Section 6.1.1.5.
.4 Resource requirements. Resource requirements are described in Section 7.1.3.1.
The duration of most activities will be significantly influenced by the resources assigned to them. For example, two people working together may be able to complete a design activity in half the time it takes either of them individually, while a person working half-time on an activity will generally take at least twice as much
time as the same person working full-time.
.5 Resource capabilities. The duration of most activities will be significantly influenced by the capabilities of the humans and material resources assigned to them.
For example, if both are assigned full-time, a senior staff member can generally be
expected to complete a given activity in less time than a junior staff member.
.6 Historical information. Historical information on the likely durations of many cat-
egories of activities is often available from one or more of the following sources:
• Project files—one or more of the organizations involved in the project may
maintain records of previous project results that are detailed enough to aid in
developing duration estimates. In some application areas, individual team
members may maintain such records.
• Commercial duration estimating databases—historical information is often
available commercially. These databases tend to be especially useful when activity durations are not driven by the actual work content (e.g., how long does
it take concrete to cure; how long does a government agency usually take to
respond to certain types of requests).
• Project team knowledge—the individual members of the project team may re-
member previous actuals or estimates. While such recollections may be useful,
they are generally far less reliable than documented results.