Designed for supervisors, line managers, H&S advisers, project HSE leads and team leaders who lead workplace incident investigations — not specialist forensic investigators.
The NEBOSH HSE Introduction to Incident Investigation is a one-day practical qualification co-developed by NEBOSH and the UK Health and Safety Executive (HSE). It equips delegates with the methodology to investigate non-complex workplace incidents — gathering evidence, conducting effective witness interviews, identifying root cause and recommending controls that prevent recurrence.
The qualification is delivered as a single unit — INV1 — covering seven topics from why we investigate, through evidence gathering and interview technique, to writing a defensible investigation report. The unique assessment is by case-study video — delegates analyse a recorded interview between an investigator and a witness and identify good and poor practice. There is no written exam.
KeyOstas delivers the NEBOSH incident investigation course as in-company training only, scheduled around your team availability and built around real scenarios from your sector. Pricing is on application — fee quotes are tailored to delegate numbers, location and the kind of incidents your team is likely to investigate. Get a fee quote for your team.
QUICK ANSWER
The NEBOSH HSE Introduction to Incident Investigation is for the people most likely to lead the first investigation after a workplace incident. It is a practical 1-day skills course built around case-study video assessment.
By the end of the NEBOSH HSE Introduction to Incident Investigation you will have a practical toolkit for leading non-complex workplace investigations — gathering evidence, interviewing witnesses, finding root cause and producing a defensible report.
INVESTIGATE & INTERVIEW
Trigger the right response, assemble the team, scope the investigation and protect the scene under HSWA 1974 and RIDDOR duties.
Apply chain-of-custody discipline to physical, paper and digital evidence; photograph, sketch and map the scene without contaminating it.
Use cognitive interviewing and PEACE-model basics to get to root cause without leading questions or accusatory framing.
ROOT CAUSE & REPORT
Distinguish immediate, underlying and root causes using ILCI loss-causation, causal-tree or fishbone diagrams. Avoid the cognitive traps that stop investigators short.
Apply the hierarchy of controls to your findings; recommend proportionate, defensible actions you can actually implement.
Structure an internal report that drives action and a regulator-ready report (HSE / ORR / EA) that withstands scrutiny.
INV1 SYLLABUS
INV1 is a single-unit, one-day qualification with seven topics, co-developed with Great Britain Health and Safety Executive (HSE). The syllabus is built around real workplace investigation scenarios — gathering evidence, interviewing witnesses without shutting them down, finding root cause, and recommending controls that actually prevent recurrence.
CHOOSING YOUR NEBOSH
The HSE Introduction to Incident Investigation is a focused 1-day skills course — designed to equip the people most likely to lead a workplace investigation. The General Certificate is the broad H&S foundation; the Diploma is the senior-practitioner route. Many delegates take the Investigation course alongside or after a General Cert.
YOU ARE HERE
Best for: Supervisors, line managers, H&S advisers and team leaders likely to be involved in incident investigations
Level: SCQF Level 6 / 1 credit point
Format: In-company at your site (KeyOstas) — typically 1-day intensive
Duration: ~7 taught hours plus pre-course reading
Assessment: Case-study film analysis (no written exam)
Sectors: All UK industries — practical investigation skills
GENERAL H&S
Best for: H&S advisers, line managers and anyone moving into H&S
Level: RQF Level 3
Format: Classroom, virtual or in-company
Duration: ~120 hrs total (10–14 days face-to-face)
Assessment: GNC1 open-book + GNC2 workplace risk assessment
Sectors: All UK industries
SENIOR PRACTITIONER
Best for: Senior H&S practitioners and aspiring CMIOSH
Level: RQF Level 6 (degree-equivalent)
Format: Classroom, virtual or distance learning
Duration: ~470 hrs total (~12 months)
Assessment: 3 written units + workplace research project
Sectors: All UK industries — strategic H&S leadership
WHO TAKES THIS COURSE
The course supports anyone likely to be the first responder to a workplace incident — supervisors, line managers, project HSE leads and H&S advisers. It also serves as practical CPD evidence for chartered safety practitioners keeping investigation skills current.
Roles the course is built for
Where it pays off
The investigation methodology is most valuable when delegates run a real investigation soon after — KeyOstas tutors offer post-course support if your team needs it.
Suitable for delegates across all UK sectors — construction, rail, utilities, manufacturing, healthcare, retail, public sector and tech operations.
ASSESSMENT
There is no written exam. Assessment is by case-study video — delegates watch a recorded interview between an investigator and a witness, then identify good and poor practice. The format tests applied judgement on the kind of investigation work delegates will actually do back at site.
Format: Watch a NEBOSH-set case-study film of an investigator-witness interview and identify good and poor practice
Duration: Completed alongside the 1-day course - no separate exam day
What you produce: Written analysis identifying interviewing strengths, weaknesses and recommended improvements
Marking: Set and marked by NEBOSH; pass / not yet competent
Results: Typically returned within 24 working days; certificate issued within 20 working days of confirmation
Resit: If marked not yet competent, you can rework and resubmit through your KeyOstas tutor
Every KeyOstas tutor has led real RIDDOR-reportable workplace investigations across construction, rail, utilities and manufacturing — not career trainers.
The case-study video format is unusual — we run live witness-interview role-plays so delegates feel the difference between a leading question and a cognitive interview.
KeyOstas brings the NEBOSH Investigation course to your site, scheduled around shift patterns and project demands.
Post-course support that keeps the methodology embedded — not just a certificate handed over.
THE NUMBERS
1
Co-developed with HSEThe only NEBOSH investigation qualification built directly with the UK Health and Safety Executive — the regulator that responds to the incidents you investigate.
1
Day to deliverDesigned as a single in-company day with no separate exam date — your team is back at work the next morning.
#1
UK investigation skills certificateThe benchmark NEBOSH certification on workplace incident investigation methodology — recognised across all UK sectors.
After two near-misses on our Tier-1 rail project, we sent our HSE team and three site supervisors through KeyOstas's NEBOSH Introduction to Incident Investigation. The video case-study assessment is genuinely useful — our delegates now run interviews that get to root cause without the witness shutting down. We've embedded the technique in our weekly toolbox talks since.
James Mitchell
SHEQ Manager, Tideway Civils & Engineering, Birmingham
WHY KEYOSTAS
01
Top-tier accreditation status with NEBOSH — the recognised mark for centres meeting the highest delivery and learner-outcome standards.
02
One of NEBOSH's longest-standing accredited centres — centre number 009, trading and training since 1984.
03
Our tutors have led real RIDDOR-reportable workplace investigations across construction, rail, utilities and manufacturing — they coach the case-study assessment live in the room.
DELIVERY MODEL
KeyOstas delivers the NEBOSH HSE Introduction to Incident Investigation in-company at your site — typically a 1-day workshop, scheduled around your shift patterns and project demands.
Bring NEBOSH Investigation training to your teamUK-wide and international in-company delivery — typically a 1-day workshop for 6 to 15 delegates per cohort.
Get a fee quote →FAQ
A NEBOSH incident investigation course is a NEBOSH-awarded qualification that teaches investigators how to gather evidence, conduct effective witness interviews, identify root causes and recommend controls. NEBOSH offers two main options: the one-day NEBOSH HSE Introduction to Incident Investigation (INV1, co-developed with HSE) for first-responders, and the full investigation module within the NEBOSH National Diploma for senior practitioners. KeyOstas delivers the Introduction course as bespoke in-company training across the UK and internationally.
The NEBOSH HSE Introduction to Incident Investigation is a one-day practical qualification co-developed with Great Britain Health and Safety Executive (HSE). It equips supervisors, line managers, H&S advisers and team leaders with the methodology to investigate non-complex workplace incidents — gathering evidence, interviewing witnesses, finding root cause and recommending controls.
It is designed for the people most likely to be the first responder to a workplace incident — supervisors, line managers, H&S advisers, project HSE leads and team leaders. It is not aimed at specialist forensic investigators; it is the practical day-one toolkit for in-house investigation work.
NEBOSH delivers it as a one-day course (approximately 7 taught hours plus pre-course reading). KeyOstas runs it in-company at the client site so we can build the scenarios around your sector — construction, rail, utilities, manufacturing, healthcare or office-based operations.
Seven topics: why we investigate, the role of leadership and the investigator, planning and preparing for an investigation, gathering evidence at the scene, conducting effective witness interviews, identifying immediate, underlying and root causes, and producing a defensible investigation report.
There is no written exam. Assessment is by case-study video — delegates watch a recorded interview between an investigator and a witness, then identify good and poor practice in writing. NEBOSH marks the assessment; results are typically returned within 24 working days.
It is credit-rated by Qualifications Scotland at SCQF Level 6 with 1 credit point. It is not formally rated against the RQF in England, Wales or Northern Ireland — it is positioned as a focused practical skills qualification rather than a level-graded one.
KeyOstas delivers the course as in-company training only — pricing is on application. Fee quotes are built around delegate numbers (typical cohort 6–15), location and the sector-specific scenarios you want covered. Get in touch and we'll send a tailored fee quote within one working day.
NEBOSH approves distance and e-learning delivery. KeyOstas focuses on in-company face-to-face delivery so the witness-interview scenarios can be role-played in the room — but virtual classroom is available for distributed teams.
The General Certificate (RQF Level 3) is a broad H&S qualification covering risk assessment, hazards and management systems across ~120 hours. The Introduction to Incident Investigation is a focused 1-day skills course on investigating non-complex incidents. Many delegates take both — General Cert for the foundation, INV1 for the specialism.
If a delegate is marked "not yet competent" on the case-study analysis, they can rework and resubmit through their KeyOstas tutor. NEBOSH may charge a resubmission fee; we cover that in your in-company quote.
Combined with broader H&S qualifications (e.g. NEBOSH General Certificate), it strengthens applications to TechIOSH and supports CPD evidence at GradIOSH and CMIOSH. On its own it does not grant IOSH membership.
Yes — it was co-developed with the UK Health and Safety Executive (HSE), making it the only NEBOSH investigation qualification built directly with the regulator. NEBOSH awards the qualification; HSE provided the technical content, the case-study scenarios and the interviewing framework.
The technical content is approachable — most delegates with relevant operational or supervisory experience pass first time. The challenge is the case-study film: delegates need to switch into investigator-mindset and write structured analysis under time pressure. KeyOstas tutors coach this live during the day.
KeyOstas delivers in-company NEBOSH Investigation training across the UK and internationally — at your head office, your operating site, or a venue you choose. Multi-site rollouts are coordinated for organisations training cohorts across regions.
It directly supports roles where incident investigation is part of the job — site supervisor, project HSE lead, line manager, SHEQ adviser, contractor H&S officer. It is also widely used as professional CPD by chartered safety practitioners (CMIOSH) keeping investigation skills current.
Speak to a senior NEBOSH tutor about your situation, study mode and start dates.
Or talk to a tutor: 0330 056 9534
Last reviewed: April 2026 — content checked against the NEBOSH INV1 syllabus guide v1.1 (Oct 2023).
