In brief
- A training certificate shows someone sat in a room, not that they placed, checked or signed off the work.
- Ask each named person what they personally did on the last job, then match that answer to a reference you can call.
- A short paid trial task on your own site tests skill faster than any portfolio review.
Contents
On any bid, portfolio attribution training gaps let a firm list jobs its current crew did not build, and certificates show attendance, not practice. Check attribution by asking each named person what they personally did, then confirm it with the client or main contractor on that job. The town name in the title marks where you apply the questions, not evidence about the work.
What does unclear past project roles hide?
A project list tells you the firm was on site, not who did what. A foreman may name a hospital or warehouse, while the crew now on the payroll joined after it finished. Training records add to the confusion because a certificate of attendance records presence at a session, not hours of supervised practice. Neither document states who set out the columns, who checked the cover to the rebar, or who signed the pour card. When roles are unclear, the bid can look strong while the skills that won the earlier job have moved to another employer. The risk grows on work that needs continuity: curing, waterproofing, jointing, backfill in layers. Ask the firm to list, for one recent job, the names and roles of the people who did each task, and whether those people are still with the company.
How do you test portfolio attribution?
Read the portfolio against the people, not the other way round. Take one completed job the bidder lists and ask four questions. First, who supervised the concrete? Second, who ran the cube or slump checks, and can you see the records? Third, which workers set out and fixed the reinforcement? Fourth, which of those people are on the crew proposed for your site? A reference call to the client or main contractor confirms the answers. Ask the bidder to describe the ground and exposure conditions recorded on the jobs it lists, and how those conditions shaped the work. Ask how the crew cured concrete and who monitored it. Ask the municipal engineer's office what records it holds for the plot, and compare those records with the firm's account. Where the answers do not line up, the portfolio is decoration.
What closes the training and assessment gap?
Assessment has to happen on the work, not in a classroom. A certificate alone does not prove a trade, and the same gap appears wherever assessment stops at attendance. Training providers can pair a short theory session with a supervised task that a trade supervisor signs off: for example, a batch of cubes, a rebar cage tied to drawing, or a length of pipe jointed and pressure tested. A contractor hiring a new crew can run a paid trial task on the site and check the result against the specification. This is the fastest way to see whether skill is present, and it works even when references are thin. Ask your contract what it allows for trials, retests and rework, and confirm the acceptance criteria with the engineer before work starts. Keep a simple record for each person: task, date, who checked it, result. That record, not a certificate, tells you what the crew can do next time.
What to do next
Pick one recent job from the bidder's list. Ask for the names and roles of the people who did the structural and waterproofing work, then call the client or main contractor and ask the same question. If the names do not match, or the people have left, price the risk before you award.
Frequently asked questions
Does a training certificate prove a worker has the skill?
No. It records attendance at a session. Ask what the worker did under supervision afterwards, and who signed off the result.
How do I check a reference when the client is hard to reach?
Ask for the main contractor, the supervising engineer or the supplier who delivered materials to that site. Any one of them can confirm who ran the work.
Local reporting: this article is written for building work in Bosaso and Puntland. Ground conditions, prices and rules differ between places; confirm the details for your own site.