In this guide
Use this material to examine your own work. Confirm current requirements, forms and dates with IStructE before applying.
The minimum standard is Ability for both Incorporated-Member and Chartered Member.
What strong and weak evidence look like
Look for
- A specification you wrote, and the reason behind a particular clause.
- A durability or exposure decision, with what drove it.
- A material problem on site (a mix that did not perform, a weld that failed inspection) and your part in resolving it.
- A comparison between materials where the answer was not obvious.
- Evidence of coordinating a material with fabrication, delivery or placing constraints.
Watch for
- Describing the properties of materials in general. Reviewers already know them, and the guidance says so directly.
- A specification copied from the previous job with nothing of yours in it.
- Experience in one material only, with no awareness of the others.
- No account of how the material is made, placed or erected.
Portfolio items that tend to work here
Suggestions, not a required list. What matters is that the item is yours, that it is annotated, and that it demonstrates the standard rather than the subject.
Questions to ask yourself
- What did I specify, and why that rather than the default?
The objective asks for an ability to specify, not an ability to describe.
- How is this material made and placed?
Specification without buildability produces details nobody can construct.
- How will it deteriorate, and who deals with that?
Durability is where material understanding becomes an engineering decision.
The same objective, in different kinds of work
| Setting | What the evidence tends to look like |
|---|---|
| Concrete | Exposure class, cover, mix constraints, early-age behaviour, and what the pour actually did. |
| Steel | Grade and sub-grade choice, fabrication and welding constraints, protective treatment. |
| Timber and masonry | Moisture, movement, durability class, and the connection detail that governs. |
Illustrative. The objectives are written to be met in a range of ways by anyone practising as a structural engineer.
How reviewers tend to approach this objective
- Asking why you specified a particular grade, class or cover.
- Asking what would go wrong if the material were substituted.
- Asking about a material you have not used, to test the breadth of your understanding.
- Asking how you would investigate a material failure.
There is a bank of original practice questions in the interview question bank, filterable by objective and by grade.
Official sources
Selected publisher pages were rechecked in September 2026. Other source records were last checked in July 2026. Open the latest official document before relying on a requirement.