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Construction software · scheduling

Construction scheduling software: Primavera P6, Microsoft Project and the rest

The scheduling tool matters less than the schedule. Still, the choice decides what owners will accept, how the team updates progress, and whether cost and time can ever be connected. This guide compares the main tools, then covers the checks that tell you whether a schedule — in any tool — can be trusted.

Updated · 10 minute read

Key takeaways
  • P6 for large or specified work, MS Project for smaller jobs, Asta as a friendlier CPM, linear tools for linear work.
  • The DCMA checks tell you if a schedule can be trusted: logic, constraints, float, durations.
  • Update weekly from site, not for the owner meeting.
  • Link activities to cost so a slip becomes dollars.

The main tools

Oracle Primavera P6

Enterprise CPM

The standard for large and public projects: critical path scheduling, resource loading, baselines and multi-project portfolios.

ExampleA GC submits a resource-loaded baseline in XER format, as the public owner’s contract requires.
Best for
Large commercial, infrastructure and any contract that specifies P6.
Check
Who on the team can actually maintain it — P6 rewards training.

Microsoft Project

CPM

Widely available critical path scheduling, familiar to many PMs.

ExampleA PM builds a 150-activity schedule for a tenant improvement and shares it as an MPP with the owner.
Best for
Small and mid-sized projects and owners who accept MPP files.
Check
Whether owners on your work require P6 XER submissions instead.

Asta Powerproject

CPM

Construction-focused critical path scheduling, popular in the UK and growing elsewhere, with a visual approach to linked bar charts.

ExampleA contractor plans a school extension with linked bars and exports to P6 for the client.
Best for
Contractors who want P6-level logic with a friendlier interface.
Check
Import and export with owners’ P6 files.

Smartsheet

Work management

Spreadsheet-style work management with Gantt views, used for lookaheads and simple programmes.

ExampleA superintendent runs a three-week lookahead that trades update from their phones.
Best for
Lookaheads, preconstruction trackers and small jobs.
Check
It is not a CPM engine — keep contract schedules elsewhere.

Linear scheduling (e.g. TILOS)

Time-location

Time–location charts for linear work — roads, rail, pipelines, tunnels — where location matters as much as sequence.

ExampleA pipeline contractor plans crews by station and date so two spreads never meet on the same stretch.
Best for
Linear infrastructure projects.
Check
How the linear view reconciles with the contract CPM schedule.

What a healthy schedule looks like

The US Defense Contract Management Agency’s 14-point assessment is the most widely used checklist. The core tests:

CheckThresholdWhy
Missing logic≤ 5% of activitiesAn activity with no predecessor or successor cannot push anything
Hard constraints≤ 5%Constraints hold dates in place so slip cannot show
High float (> 44 days)≤ 5%Usually a sign of missing logic
Negative float0%The schedule already cannot meet a date
Long durations (> 44 days)≤ 5%Too coarse to status weekly
Leads (negative lags)0%Hide overlap assumptions

The free schedule health check runs these on a P6, MS Project or Excel export, and the schedule PDF converter turns a PDF schedule into rows first.

CalculatorQuick schedule health check

Updating: where schedules go wrong

Most schedules are accurate on the day of the baseline and fiction by month three. Update weekly with actual starts, finishes and remaining durations from site; re-run the critical path; and record why dates moved. A schedule updated for the owner meeting rather than for the work cannot warn anyone — and neither can any AI scheduling tool reading it.

CPM baselinedates, logic, floatLook-ahead3 weeks, crew-levelField update% and actual datesProgressearned valueForecastcost and finishevery week the field update re-forms the look-ahead
The master schedule is only the spine. The weekly loop — update the field, re-form the look-ahead — keeps it true, and is what makes progress percentages worth trusting.

Connecting time to cost

A three-week slip is a number of dollars: extended general conditions, overtime to recover, liquidated damages. Cost-load the schedule or link its activities to cost codes, and a slip becomes a forecast change rather than a date on a chart. See earned value management for how schedule performance and cost performance combine.

Getting a schedule out for analysis

Schedule reviews, claims and dashboards all start with an export. What to ask for, by tool:

ToolNative exportKeeps the logic?
Primavera P6XER (P6's own exchange file), or XMLYes — activities, relationships, calendars, constraints
Microsoft ProjectMPP, or XMLYes
Either, as PDFA printed Gantt chartNo — dates only, no relationships

Always ask for the native or XML file with the baseline included; a PDF can show what the dates are but not why. When only a PDF exists, the schedule PDF to Excel converter recovers the activity table, and the schedule health check runs the standard logic checks on it.

Checklist
Schedule health check in Excel, filled in with example rows — columns: Check, Count, Activities, %, Threshold, Pass?, Worst offenders, Fix
The schedule health check as it opens in Excel: example rows in italics, calculated columns shaded.
Free template · Schedule health check (Excel & CSV)An Excel workbook with drop-downs, validation and formulas built in — or the same columns as a CSV for Google Sheets and Numbers.
Download Excel (.xlsx)
What this template captures

Each schedule check with its count, the activities affected, the share calculated against the threshold, pass or fail, the worst offenders and the fix.

8 columns: 6 you fill in, 1 picked from drop-down lists, so every row uses the same values and 1 calculated by formula and filled down 200 rows, so nothing is worked out by hand. In the Excel version, 1 column reject entries of the wrong type (a date column only takes dates, an amount column only numbers), the header row stays frozen with filters on it, and the workbook opens on an Instructions sheet that lists every column below.

Every column, and how it is captured
ColumnTypeWhat goes in it
CheckTextFree text.
CountNumberEnter a number.
ActivitiesTextFree text.
%CalculatedCalculated: [Count] ÷ [Activities] × 100
ThresholdTextFree text.
Pass?Drop-downOptions: Yes / No.
Worst offendersTextFree text.
FixTextFree text.

See it on real-looking numbers

Constructelligence is a construction intelligence platform: it reads your ERP, project and field systems read-only and does this arithmetic every week, for every job. The demo runs it on a sample eight-job portfolio.

Try the demoJoin the private beta

Frequently asked questions

What is the best construction scheduling software?

Oracle Primavera P6 for large and public projects or where the contract requires it; Microsoft Project for small and mid-sized work; Asta Powerproject for a construction-focused alternative; linear scheduling tools for roads, rail and pipelines. Smartsheet suits lookaheads but is not a CPM engine.

What is the difference between P6 and Microsoft Project?

Both do critical path scheduling. P6 is built for large, multi-project and resource-loaded programmes and is often required by public owners; Microsoft Project is simpler, widely available and suits smaller projects. Many owners require P6 XER files for submissions.

What is the DCMA 14-point assessment?

A widely used set of schedule quality checks from the US Defense Contract Management Agency — including missing logic, hard constraints, high float, negative float, long durations and leads — each with a threshold, typically 5% of activities.

How often should a construction schedule be updated?

Weekly on active projects, with actual dates and remaining durations from site. Monthly updates are common contractually but too slow to warn anyone about a slip in time to recover it.

What is an XER file?

Primavera P6's native export format. It carries the schedule's activities, relationships, calendars, constraints and resources, so another P6 user or an analysis tool can rebuild the full schedule logic from it.

Can you convert a P6 schedule to Excel?

Yes. P6 can export activity data to a spreadsheet directly, and an XER can be read by analysis tools. If you only have a PDF of the schedule, a PDF-to-Excel converter can recover the activity table, but not the relationships.

CI
Written by the Constructelligence teamConstruction finance and software. Worked examples use the sample demo portfolio; formulas are standard practice. Reviewed September 2026.
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