- NWD
- Navisworks Document. A published, self-contained Autodesk Navisworks file holding the aggregated 3D model of a facility, including object hierarchy and engineering properties attached to each item.
- XER
- The native exchange format of Oracle Primavera P6. Unlike a spreadsheet it carries activities, calendars, relationships, resources and assignments, so a schedule can move between P6 databases without being rebuilt.
- Process area
- A physical system within a plant, such as inlet receival, acid gas removal or mercury removal. Grouping items into process areas is what makes installation sequencing possible, because construction happens area by area.
- Area gating
- A sequencing rule where bulk disciplines in a process area, such as piping, electrical and instrumentation, cannot start until every piece of equipment in that area is ready.
- Erection and grouting
- The two core installation steps for mechanical equipment: setting the unit in place, then grouting it to its foundation before connected work proceeds.
- Finish to start (FS)
- The most common Primavera P6 relationship type. The successor activity cannot start until the predecessor finishes, optionally offset by a lag.
- Lag
- A delay applied to a relationship, used where methodology requires curing, testing or access time between two activities.
- Resource loading
- Assigning crews and hours to activities so a schedule reflects the labour actually required. When crew sizing comes from project staffing data rather than assumptions, the schedule can be levelled meaningfully.
- Installation sequence
- The ordered network of construction activities and dependencies describing how a facility is physically built, from equipment erection through bulk discipline completion.
- 4D BIM
- Linking an existing schedule to 3D model geometry so the construction sequence can be visualised over time. It consumes a schedule; it does not create one.
- TimeLiner
- The 4D module inside Autodesk Navisworks. It links model objects to activities from an imported schedule such as a Primavera P6 project so the sequence can be simulated. It requires a schedule as an input rather than producing one.
- Advanced Work Packaging (AWP)
- A capital project delivery approach that breaks scope into construction work packages aligned to engineering and procurement, so field crews receive complete, executable packages. Model driven area assignment and sequencing feed directly into the packaging structure.
- WBS
- Work Breakdown Structure. The hierarchical decomposition of project scope that a Primavera P6 schedule is organised around. Model driven planning maps items to WBS through their physical process area rather than by hand.
- Schedule to model alignment
- The state where every activity in the schedule corresponds to identifiable scope in the 3D model. Alignment breaks down when the model is revised and the schedule is maintained separately.
- NWC
- Navisworks Cache. The intermediate file produced when a native CAD or authoring file is read by Navisworks, later aggregated and published into an NWD.
- EPC
- Engineering, Procurement and Construction. The contracting model used for most oil & gas, LNG and industrial gas facilities, where one contractor carries design through to construction.
- Project controls
- The discipline covering planning, scheduling, cost control and progress measurement on a capital project. The team that owns the P6 schedule.
- Equipment master
- A single canonical inventory of every item on a facility, reconciled across model properties, engineering spreadsheets and project cost and schedule data.
- Model containment and connectivity
- Structural information held in the 3D model describing which items sit inside which assemblies and what connects to what. Used to infer process area membership.