What is the difference between a Gantt chart and the CPM network?

They are two views of the same schedule. The Critical Path Method network is the logic diagram: activities as nodes, dependencies as arrows, used to compute early and late dates and float. The Gantt chart is the timeline view of that result: each activity drawn as a bar along a calendar, dependencies shown as links, and the critical path usually colored so it stands out. The network is how the schedule is reasoned about; the Gantt is how it is read and communicated. Most people on a project only ever see the Gantt, because it answers the practical questions, what is happening when, and what depends on what, at a glance.

What are Primavera P6 and XER files?

Primavera P6 is the scheduling software most large and complex construction projects are planned in, and XER is its native file format for exchanging a schedule. When a scheduler sends a P6 schedule to another party, they typically export an XER file, which carries the activities, logic, dates, and calculated float. Microsoft Project, the other common tool, uses an XML export for the same purpose. These exchange formats matter because the schedule usually has to travel between the party that built it and everyone who needs to read it, and a system that cannot read XER or Project XML cannot show the schedule those tools produced without someone re-keying it.

Can POD read my Primavera P6 or Microsoft Project schedule?

Yes, through the standard exchange formats. POD reads a Primavera P6 schedule exported as an XER file and a Microsoft Project schedule exported as XML, picking up the activities, dates, float, and the critical path the tool computed, and renders the activities and critical path as a Gantt you can view and share. The one caveat is the native binary Microsoft Project file, the .mpp, which is not read directly in POD's environment, so the reliable path is to export to XML first, which Project does natively. Starting from the exchange format rather than the proprietary binary is both what works and what the rest of the project team is usually already sending.

Construction Glossary · Scheduling

The GanttChart

Bars on a calendar, links between them, the critical path lit. It is how a thousand-line CPM schedule becomes something a room full of people can read at a glance.

Definition

A Gantt chart is the horizontal bar-chart view of a project schedule: each activity is a bar placed by its start and finish dates, with dependencies drawn between them and the critical path usually highlighted. It is the most common way to read a CPM schedule. Primavera P6 and Microsoft Project are the dominant tools that produce them; P6 exchanges schedules through the XER file format and MS Project through XML, which is how a schedule moves between systems.

The schedule you can actually read

Each activity is a bar on the calendar; the critical ones are highlighted and a link shows the dependency. The same data the CPM network reasons about, drawn so anyone can follow it.

How a schedule travels

A schedule is built in one tool and read by everyone else, so it moves as an exchange file. These are the formats that carry it.

Tool	Exchange format	Readable by POD?
Primavera P6	XER	Yes
Microsoft Project	XML export	Yes
Microsoft Project	.mpp (native binary)	Export to XML first

How POD renders your Gantt

POD reads a Primavera P6 schedule exported as XER, or a Microsoft Project schedule exported as XML, and renders a Gantt of the activities and the critical path the scheduling tool computed, with each activity’s float read alongside, placed next to the daily reports and the rest of the project record. The native .mpp binary is not read directly in POD’s environment, so Project schedules come in as an XML export. POD renders and reads the schedule the tool produced; it does not run the Critical Path Method itself. The value is seeing the Gantt in the same place as the field status, so a slip in the field is read against the bar it affects.

Construction scheduling software guide

Frequently asked questions

The bars are driven by the logic beneath

Every bar’s position comes from the critical-path logic. To read a Gantt well is to know which bars have zero float and which have room.

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