P6 where the contract names it or you run a portfolio. MS Project where one team runs one job and nobody is a full-time planner. Most comparisons skip the first part, and it decides most cases.
Check the schedule submission clause first. If the contract names Primavera P6 and requires a native .xer each period — common on Australian infrastructure and government work — the comparison is over and you use P6.
Where you have a genuine choice: P6 for many interlinked projects, rigorous resource and cost loading, and schedules you may have to defend in a claim. Microsoft Project for one project run by people who are not full-time planners and need the schedule to be readable by everyone else.
And the part that decides less than people expect: both are scheduling tools. Neither carries a live risk register, reconciles actual cost against the schedule, or writes your monthly report. Choosing between them does not close that gap — it just changes which file you export.
| Primavera P6 | Microsoft Project | |
|---|---|---|
| Built for | Portfolios of large, interlinked projects | A single project, one team |
| Typical user | A full-time planner or scheduler | A project manager who also does other things |
| Scale | Tens of thousands of activities without complaint | Comfortable in the hundreds to low thousands |
| Resource & cost loading | Deep — the reason it is specified on major work | Present, but lighter and less commonly relied upon |
| Baselines | Multiple, retained and comparable | Multiple, more limited in practice |
| Exchange format | .xer, plus XML. The de facto industry currency | .mpp, plus MSPDI XML |
| Learning curve | Steep. Assumes you know CPM before you start | Gentle by comparison |
| Reporting | Capable but painful — usually worked around, not used | Better out of the box, still not a monthly report |
| Contractual acceptance (AU) | Frequently specified by name | Usually acceptable where no tool is named |
Licensing on both moves often enough that quoting a price here would be wrong within a quarter. Get a current quote — and for P6, be clear whether you are being quoted Professional or the EPPM/cloud offering, because they are different products with different costs.
A pattern worth separating from the tool itself, because it is about how the tool gets used rather than what it can do. Nearly every Microsoft Project schedule I have been handed has been poorly built.
The milestones are there, usually correct, usually complete. What is missing underneath them is maturity in the relationships, and with that missing there is no meaningful critical path. You get a list of dates that looks like a project but cannot behave like one, because nothing flows.
MS Project is perfectly capable of a properly linked network. It just does not force you into one, and P6 more or less does, depending on the quality of the inputs. Messy relationships going in, messy critical path out.
| Your situation | Pick | Why |
|---|---|---|
| Contract names P6 or requires a native .xer | P6 | The submission clause decides it — no comparison needed |
| Several projects sharing people and plant | P6 | Portfolio resource levelling is the thing MS Project doesn't do |
| You expect to make or defend a delay claim | P6 | Retained baselines and activity coding are the evidence an expert asks for |
| One project, nobody is a full-time planner | MS Project | Simple enough to keep honestly updated — which beats sophistication |
| The schedule must be readable across a Microsoft 365 team | MS Project | Everyone can already open it |
| Submission requires a DCMA 14-point pass | Either | Build quality decides it, not the logo — run the 14 checks on what you have |
| The real pain is the monthly report | Neither | Switching schedulers won't fix reporting — add the layer above instead |
Then it is chosen. Read the schedule submission clause before anything else — and check whether it also requires a DCMA 14-point assessment, because that changes how you build the schedule, not just which product opens it.
P6. Resource levelling across a portfolio is the thing it does that the alternative does not.
P6, and status it properly every period. A claim is built on contemporaneous records, and retained baselines with clean activity coding are what an expert will ask for.
Microsoft Project. A schedule that gets updated honestly in a simpler tool beats a sophisticated one nobody maintains.
Then this comparison will not fix it, and switching tools is an expensive way to find that out. See below.
The contract mandating P6 is the version of this everyone plans around. The one that actually catches people out is quieter: the project outgrows Microsoft Project. It demands more than the tool can sustain, and the schedule has to move.
I have done that migration. It was manual and it was painful — there is no clean path that preserves what matters, so you rebuild while the job keeps running.
Which is why the honest advice is to judge the tool against where the project is heading, not where it is now. Migrating under pressure costs far more than starting in the heavier tool would have.
Both are scheduling tools, and both are good at scheduling. The gap is what sits around it — and on most construction projects that gap is filled by a spreadsheet somebody rebuilds by hand every month.
None of this is a criticism of either product. They were built to schedule, and they schedule. It is just that "which scheduling tool" is a smaller question than it looks, and it is not the one causing the pain in most controls functions.
Worth being blunt, because the category is currently full of claims that do not survive a second question.
AI is not what computes your schedule. Critical path method is deterministic arithmetic and has worked without machine learning since the 1950s. Any tool implying a model calculates your dates is describing a solved problem, and if a language model really were generating those numbers you should be alarmed rather than impressed.
The genuine opening is in the reading. A monthly cycle produces more change than a person can review properly: hundreds of activity movements, a risk register that shifted, cost that moved against a forecast. Knowing which of those matter, and writing it in language a board can act on, is real work that currently gets done badly because there is no time to do it well.
So the honest test for anything in this space, ours included:
While it can replace P6 or Microsoft Project, and it does not try to. Your project schedule stays exactly where it is, in the tool your contract or your planner requires. Aegis reads what that tool already exports each period — .xer, MS Project XML, Excel or CSV — and does the layer above it.
That means earned value against real cost, a quantified risk register with expected exposure against contingency, a forecast expressed as a probability rather than a single date, and a written assessment of what changed since last period, with every rating traceable to the number that produced it.
Two things it deliberately does not do, stated here rather than discovered later: it does not write back to your scheduling tool, and in the case of P6, it does not need to. It is expected that for a smaller organisation using MS Project, the switch to Aegis is simple, and one-off. For Primavera users, it is expected that P6 is integrated into an ERP, in this case Aegis would simply sit over the top, ingest P6 data and turn it into Dashboard and actionable data for leadership and PM ingestion.
They solve different sizes of problem. P6 for portfolios, rigour and claims; MS Project for a single project run by people who are not full-time planners. On major Australian infrastructure the contract often settles it before features come into it.
Not directly. You go via XML and accept losses — activity codes, calendars, resource assignments and baselines commonly do not survive. If you must submit in P6 format, plan in P6 rather than converting into it monthly.
Check the schedule submission clause. Many Australian infrastructure and government contracts name it and require a native .xer, sometimes with a DCMA assessment attached — you can run those 14 checks free here.
No. Replacing a mandated scheduling tool to fix a reporting problem is an expensive way to solve the wrong thing. The reporting layer reads what P6 already exports.
Not in computing the schedule — that is deterministic maths. In the reading: what changed, what matters, and saying so in language a board can act on. Judge any claim by whether the numbers underneath are computed or generated.
Aegis reads the same P6 or MS Project export you already produce each period and turns it into earned value, a quantified risk position, a probabilistic forecast and a written assessment — with every rating traceable to the number behind it.
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