Scheduling software and the PMIS are considered enterprise environmental factors. Enterprise environmental factors are external environmental and internal organizational environmental factors that influence the project's success.  PMP preparation includes hands-on use of scheduling software.

TEMPLATES made from information from similar past project's activity lists are often used for a new project. Templates typically contain related activity attribute information such as:

resource skills and required hours
identified risks
expected deliverables lists

TEMPLATES may be used to establish SCHEDULE MILESTONES.

Rolling Wave Planning involves:

planning short-term work in detail at low levels of the WBS
planning future work at high levels of the WBS that will be detailed  within one or two periods

The project manager utilizes the following to define the ACTIVITY LISTS are documented tabulations of schedule activities showing:

the activity description
the activity identifier
scope of work
    
The Schedule Activity Scope of Work may be represented:

in physical terms (pipe)
by the number of drawings
in lines of computer program code
in the chapters in a book

ACTIVITY ATTRIBUTES are used for:

project schedule development- selecting, ordering, and sorting planned schedule activities within reports

Schedule Activity attributes include:

time leads and lags
resource requirements
the person responsible for executing the work
logical relationships
activity identifiers
activity description
predecessor and successor activities
imposed dates
constraints and assumptions
the place, type of work, and effort

Milestones required by the contract are considered MANDATORY MILESTONES.

OPTIONAL MILESTONES are those based on project requirements or on historical information. PMP Exam Preparation includes examples of these.

THE MILESTONE LIST is a component of the project management plan and used in the schedule model.

Develop the project schedule—Sequence Activities
The activity sequencing process provides a means of identifying and documenting dependences among schedule activities.

Activity sequencing outputs include:

project schedule network diagrams
project document updates

Schedule activities are logically sequenced using:

precedence relationships
leads
lags

Product characteristics can affect activity sequencing. THE PROJECT SCOPE STATEMENT characteristically describes major project deliverables, objectives, assumptions, constraints, and the statement of work, which also impacts activity sequencing.

PRECEDENCE RELATIONSHIPS  used in PDM networks may be:

Finish-to-Start
Start-to-Finish
Finish-to-Finish
Start-to-Start

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