A safe system of work is a planned and organised way of carrying out a task so that the risks are controlled. It says what the job is, who does it, in what order, with what equipment and under what controls. It is built on a risk assessment, and on site it is usually set out in a method statement that the people doing the work have read and understood.
Key takeaways
- A safe system of work is a formal, planned method for doing a task with the risks under control.
- It starts with a risk assessment: you cannot plan safe work until you know the hazards.
- A method statement is the usual written form of the system for a particular task.
- It covers people as well as equipment: competence, supervision, information and training matter as much as the plan.
- You are expected to follow the system, and to stop and ask if conditions change or something does not match the plan.
- A system of work needs reviewing when the task, the site or the people change, or after something goes wrong.
What a safe system of work means
The plain definition is: a safe system of work is a documented, step-by-step way of doing a job that has been planned to keep people safe. Other phrases mean much the same thing in everyday use, such as "safe working system", "safe method of work" or "safe working procedure".
The word "system" is important. Safe work is not only about wearing the right equipment or having one good rule. It is a joined-up arrangement of people, tasks, equipment, the environment and supervision. If one part is missing, such as nobody checking that the plan is followed, the whole system is weaker.
The legal background
The Management of Health and Safety at Work Regulations 1999 do not use the phrase "safe system of work" as a heading, but they set out the duties that a safe system of work puts into practice. In plain English, they require employers to:
- Assess the risks to workers and others affected by the work.
- Put in place sensible preventive and protective measures, following the principles of prevention.
- Make arrangements for the effective planning, organisation, control, monitoring and review of those measures.
- Appoint competent people to help them meet health and safety duties.
- Give workers clear information and suitable training.
Read as a whole, that is a safe system of work: assess, plan, organise, tell people, check and review. The regulations are on legislation.gov.uk, and the page in our sources is the place to read the exact wording. Do not rely on a summary, including this one, for a legal question.
How it links to risk assessment
HSE's risk page sets out three steps: identify hazards, decide how likely harm is and how serious, and take action to eliminate or control the risk. Regulation 3 of the 1999 Regulations requires a suitable and sufficient assessment, and regulation 3(6) requires the significant findings to be recorded where an employer has five or more employees. Those precautions are the controls that go into the safe system of work.
The relationship is straightforward:
- The risk assessment answers: what could go wrong, who could be hurt, and what must be done about it?
- The safe system of work answers: given those findings, how will we actually do this job, step by step?
- The method statement is the written version the workers use on the day.
You can read more about the ordering of controls in our hierarchy of control explained article, and about the written task document in method statements explained.
What a safe system of work usually contains
The exact content depends on the task. A simple, low-risk job might need a short method. A complex or high-risk job needs much more. The table shows the common parts.
| Part | What it covers |
|---|---|
| Task description | What the job is, where it is done and what the end result should be |
| Hazards and risks | What could cause harm, taken from the risk assessment |
| Controls | The measures chosen to remove or reduce each risk, including equipment and barriers |
| Sequence of work | The order of the steps, so that no step creates a new hazard for the next |
| People | Who does the job, what skills or certificates they need, and who supervises |
| Equipment and materials | What is needed, and that it is suitable, inspected and in good order |
| Communication | How the team talks to each other and to others on site, for example signals or radios |
| Emergency arrangements | What to do if something goes wrong, including who to contact and where to go |
| Permits | Any permit to work needed for higher-risk tasks, and who can issue it |
| Review | When and how the system will be checked and updated |
Permits to work
Some tasks need a permit to work as part of the system. A permit is a formal authorisation that confirms the hazards have been considered and the controls are in place before the work starts. It is typically used for higher-risk work such as hot work or entry into confined spaces. Whether a permit is needed depends on the task and on your employer's procedures, so follow what your site requires.
Safe system of work checklist
Use this list to judge whether a system is sound, whether you are writing one or being briefed on one.
- [ ] There is a current risk assessment for the task.
- [ ] The method is written in plain language and in a sensible order.
- [ ] The controls match the risks, and the most effective controls are used first.
- [ ] The people doing the job are competent and have been briefed.
- [ ] The equipment is suitable, checked and available before starting.
- [ ] Other trades and the public are protected from the work.
- [ ] Emergency arrangements are known to everyone on the job.
- [ ] Someone is responsible for checking that the system is followed.
- [ ] There is a clear rule for what to do if conditions change: stop and ask.
What your role is
A safe system of work only works if the people doing the job follow it. In practice, that means:
- Read the method statement before you start. If you have not seen it or do not understand it, ask.
- Check you are competent for the task. If you are not trained or certified for the job, say so before you begin.
- Follow the sequence and the controls. Do not skip steps to save time.
- Stop if something changes. A different weather condition, a missing barrier, new people in the area or damaged equipment all mean the plan no longer matches the job.
- Report problems and near misses. They are the first sign the system needs reviewing.
Common mistakes
- Treating the paperwork as the system. A method statement that sits in an office and is never read is not a safe system of work.
- Copying an old document for a new job. Each task and site has its own hazards.
- Planning for the normal day only. The system should say what to do when things go wrong.
- Forgetting people other than the workers. Visitors, other trades and members of the public may be affected.
- Never reviewing it. Conditions change, and so must the plan.
Worked example: replacing a damaged floor opening cover
Suppose a supervisor is asked to replace a damaged temporary cover over a floor opening. This is a general practice illustration, not an HSE or CITB example. A safe system of work for it might run like this.
- Assess. The supervisor identifies the hazards: people could fall through the opening while the cover is off, and the work may expose others on the floor below to falling items. The risk assessment decides what must be done.
- Plan. The method states who will do the job, what equipment is needed, and that the new cover is fixed before the old one is fully removed if that can be done safely.
- Protect others. Barriers and signs go up around the area, and the people on the floor below are told when the work will happen.
- Brief. The team reads the method statement, asks questions and confirms that they are competent for the task.
- Do the work. The team follows the sequence. If a barrier is missing or the weather changes, they stop and tell the supervisor.
- Review. Once finished, the supervisor checks that the new cover is secure and asks whether the method needs to change for next time.
The same job with no system could easily go wrong: someone removes the old cover first, nobody warns the floor below, and the new cover is not ready. The system is what prevents those gaps.
How the system connects to other guides
A safe system of work brings together ideas that appear in several guides on this site.
- The method statements explained guide covers the written form of the system and what a good statement should show.
- The hierarchy of control explained guide helps you check that the controls in the system are the strongest available, not just the easiest to arrange.
A quick question to ask on any job is: "If something changes, does the plan tell me what to do?" If the answer is no, the system is incomplete.
Using this for the CITB test
This site does not reproduce official test content, so learn the idea here and test yourself with our free practice questions. To see the layout of the test, read the operatives test format page. Practice is not an official result, and this site is independent and not affiliated with CSCS or CITB.
FAQ
What is a safe system of work in simple words?
It is a planned, documented way of doing a job so that the risks are controlled. It says what the task is, who does it, in what order, with what equipment and under what controls. On site it is usually written up as a method statement.
Is a safe system of work the same as a method statement?
Not exactly. The safe system of work is the whole arrangement, including the risk assessment, the controls, the people and the supervision. The method statement is the written description of how a task will be done, and it is the most common document for the system.
Who is responsible for providing a safe system of work?
Employers have the main legal duty to plan and provide safe working arrangements for their workers, and others on site have duties too. In practice the planning is usually done by a supervisor or manager. Workers must follow it and report problems.
What should I do if the system does not match the job?
Stop work and tell your supervisor. If the conditions, equipment or people have changed from what the method statement assumed, the controls may no longer be enough. Work should restart only when the plan has been checked and changed if needed.
Sources
Independent guide, not affiliated with, authorised by, approved by or endorsed by CSCS or CITB. Last updated 2026-10-08.