Construction quality assurance (QA) verifies that work is carried out in accordance with the design, specification, and applicable standards: and that this is documented and auditable.
The core tool for structuring QA on Australian projects is the Inspection and Test Plan (ITP).
Inspection and Test Plans (ITPs)
An ITP is a structured document listing every activity in a work process, the inspection or test required at each stage, the acceptance criteria, and who is responsible for sign-off.
| ITP Column | Content |
|---|---|
| Activity/Process Step | e.g. "Place reinforcement", "Pour concrete" |
| Reference Document | Drawing, specification clause, standard |
| Inspection/Test Method | Visual, survey, laboratory test |
| Acceptance Criteria | Tolerance, strength, compliance requirement |
| Responsibility | Contractor QA, superintendent, third-party |
| Records | Checklist, test certificate, photo, survey data |
Hold Points, Witness Points, and Review Points
| Point Type | Meaning |
|---|---|
| Hold Point (HP) | Work cannot proceed past this point without the nominated party's inspection and sign-off |
| Witness Point (WP) | The nominated party may attend, but work can proceed if they do not (with notice given) |
| Review Point (RP) | Documentation is reviewed, but does not halt physical work |
Hold points are typically placed before work becomes concealed or irreversible: e.g. before backfilling a trench, before concrete pour over reinforcement, before covering waterproofing.
Typical Hold Points by Trade
| Trade/Activity | Common Hold Point |
|---|---|
| Earthworks | Subgrade proof-rolling before pavement layers placed |
| Reinforced concrete | Reinforcement fixed, before pour |
| Piling | Pile integrity testing, before pile cap construction |
| Waterproofing | Membrane inspection, before covering/backfilling |
| Structural steel | Bolted/welded connection inspection before load-out |
Non-Conformance Reports (NCRs)
When work fails to meet acceptance criteria, it is documented via a Non-Conformance Report:
- Identify and document the non-conformance
- Assess extent (isolated defect vs systemic issue)
- Propose and approve a corrective action (rework, repair, or engineering acceptance of "as-is")
- Close out with verification that the corrective action was effective
Quality Management System Structure
Most Australian contractors operate QA under an ISO 9001-aligned quality management system:
Project Quality Plan
├── ITPs (per work activity)
├── Test Reports & Certificates
├── NCR Register
├── Design/Document Control
└── Audit Records
Relationship to Standards and Specifications
ITP acceptance criteria are drawn directly from:
- Project specification (often referencing AS standards, e.g. AS 3600, AS 1289 for geotechnical testing)
- Approved for Construction (AFC) drawings
- Manufacturer's requirements for proprietary products
Practical Notes
- Hold points only work if they're enforced: a hold point routinely bypassed under programme pressure defeats the entire QA system and creates liability exposure.
- NCRs should be closed with verified corrective action, not just a signature: recurring non-conformances usually indicate a process problem, not a one-off error.
- ITP acceptance criteria should be specific and measurable (e.g. "compaction ≥ 95% MDD") rather than vague ("adequately compacted") to be enforceable on site.