NEBOSH International Diploma Unit DI1/D1 Assessment Preparation Guide | How to Pass First Time
NEBOSH International Diploma (IDip) DI1 Assessment
The NEBOSH Level 6 International Diploma for Occupational Health and Safety Management Professionals is an advanced health and safety qualification that develops the knowledge and skills needed for higher-level health and safety responsibilities.
The International Diploma includes three assessments: DI1, DI2 and DI3. DI1 uses a two-part assignment and gives you the opportunity to demonstrate how you can apply your Diploma-level H&S knowledge to realistic situations, workplace activities, personal experience and research.
This guide explains the NEBOSH DI1 assessment process, how to prepare for DI1 and practical ways to approach each part of the assessment effectively. It also covers assessment techniques, common mistakes to avoid and tips to improve your chances of passing first time.
Assessment structure
The DI1 assessment focuses on workplace H&S principles and is completed as a two-part assignment.
Assessment Detail
DI1 Information
Assessment
DI1
Format
Two-part assignment
Main Focus
Workplace H&S principles
What You’ll Do
- Simulation-based questions
- Workplace activities
- Reflective tasks
- Research project
Expected Assessment Time
Around 40 hours
Submission Period
20 working days
Closing Interview
Yes
How to Pass the NEBOSH DI1 Assessment
The DI1 assessment gives you the opportunity to show that you can apply your Diploma-level H&S knowledge to realistic situations, workplace activities, personal experience and research.
Preparation Step
What to Do for DI1
01 Know the Assessment Format
Understand the simulation questions, workplace activities, reflective tasks and research project.
02 Revise the DI1 Syllabus
Review the relevant syllabus topics and strengthen any weaker areas.
03 Understand the Tasks
Familiarise yourself with what each type of DI1 task requires.
04 Arrange Workplace Access
Make sure you have access to a suitable organisation for the workplace activities.
05 Practise Research & Referencing
Build your skills in finding reliable information and referencing sources appropriately.
06 Use Official NEBOSH Resources
Review the DI1 sample assessments, learner guides and assessment guidance provided by NEBOSH.
07 Practise DI1-Style Tasks
Use sample materials and practise tasks to become familiar with applying your knowledge.
08 Use Tutor Support
Use guidance and feedback from your Learning Partner to strengthen your preparation.
09 Plan Your Study
Create a realistic revision plan and use study methods that work well for you.
10 Keep & Review Notes
Keep your study notes organised and revisit key DI1 topics regularly.
11 Plan Your Assessment Time
Allow enough time for research, workplace activities, writing, referencing and final checks.
How to Prepare for the NEBOSH DI1 Assessment
Start preparing before the assessment window opens so you are familiar with the format, syllabus and skills required
The assessment covers four main areas:
01
Simulation-Based Questions
You will work with a realistic workplace scenario and answer tasks based on the information provided.
The scenario may contain a lot of detail, so read it carefully and separate the important evidence from information that isn’t relevant to the task.
When answering:
- ✓ Read the complete scenario first.
- ✓ Identify facts relevant to each task.
- ✓ Check exactly what the question requires.
- ✓ Use scenario evidence where appropriate.
- ✓ Apply your H&S knowledge to the situation.
- ✓ Explain your points clearly.
- ✓ Complete every required task.
Avoid generic answers. Your response should show how your knowledge applies to the situation presented.
02
Workplace Activities
The workplace activities test your ability to put your H&S knowledge into practice in a real organisation.
The organisation does not necessarily have to be your own workplace, but it needs to be suitable for the activities you are required to complete.
When carrying out the tasks:
- ✓ Understand the organisation and its activities.
- ✓ Focus on what the assessment asks you to investigate.
- ✓ Use relevant workplace evidence.
- ✓ Apply your H&S knowledge to your findings.
- ✓ Consider both good practice and areas for improvement where relevant.
- ✓ Explain the reasons behind your findings.
The aim isn’t simply to find faults. It is to demonstrate that you can assess a workplace objectively and apply your professional knowledge.
03
Reflective Tasks
Reflective tasks ask you to draw on your own personal or professional experiences.
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Rather than simply describing what happened, explain what you did, what you learned and how the experience helped you develop.
A simple structure is:
Experience
→Action
→Learning
→Development
Keep your response focused and follow any guidance provided for the task.
04
Short Research Project
The research project requires you to investigate a specified topic and develop an evidence-based response.
Start by understanding the research question before gathering information.
When completing the project:
- ✓ Use credible and relevant sources.
- ✓ Consider different evidence or viewpoints.
- ✓ Evaluate the information you find.
- ✓ Develop your own argument.
- ✓ Support your points with evidence.
- ✓ Reference your sources appropriately.
- ✓ Fact-check and proofread your work.
Don’t rush straight into writing. Allow enough time to research, evaluate the evidence, draft and review your response.
How to Prepare for the NEBOSH DI1 Assessment
✓
Know the command words – Understand what identify, explain, justify and evaluate ask you to do.
✓
Read the task properly – Be clear about what is being asked before writing.
✓
Stick to the question – Keep your answer relevant and avoid unnecessary detail.
✓
Use the marks as a guide – They help indicate how much detail is expected.
✓
Apply your H&S knowledge – Link your knowledge to the scenario, workplace or task.
✓
Back up your points – Use relevant scenario evidence, workplace findings or research.
✓
Explain, don’t just list – Show why your points matter.
✓
Use reliable sources – Reference external information correctly.
✓
Use your own words – Your submission must reflect your own understanding.
✓
Manage your time – Leave enough time to review your work.
✓
Use mocks and feedback – Practise with sample assessments and act on tutor feedback.
✓
Check before submitting – Complete every task, check references and proofread.
Closing Interview for DI1
A closing interview follows the DI1 assessment to help confirm that the submitted work is your own.
Before the interview, review your submission and be ready to discuss your answers, evidence, research and reasoning in your own words.
The closing interview is a required part of the NEBOSH assessment process.
NEBOSH DI1 Pass Mark
The provisional pass mark for DI1 is 50%.
You must also successfully complete DI2 and DI3 to achieve the NEBOSH International Diploma. NEBOSH confirms the final pass mark for each assessment through its awarding process.
Once all three units are passed, the unit percentage marks are combined to determine your overall grade:
Pass: 150–195
Credit: 196–225
Distinction: 226 or above
Final Thoughts
Passing the NEBOSH DI1 assessment comes down to applying your H&S knowledge, answering what is asked and supporting your points with relevant evidence. Good preparation and careful time management can help you approach each task effectively.
For the next stage, read our guide on how to prepare for and pass the NEBOSH DI2 and DI3 assessments, including practical tips for tackling both assessments.