- Definition — an SOP is a step-by-step instruction for one job, written so that a trained person can do the job the same way every time.
- Why they fail — they are long, they live in a binder nobody opens, and they go out of date when the machine or the method changes.
- The fix — short steps with a picture each, kept where people work, updated from a video when the job changes.
Standard operating procedure meaning
A standard operating procedure, or SOP, is a written instruction that explains how to do one job, step by step, so that everyone does it the same way.
“Standard” means agreed. The procedure is the way the company has decided this job is done. “Operating” means it is about doing the work, not about policy. “Procedure” means steps in order.
SOPs exist in every industry. In a plant you find them for machine start-up, changeovers, cleaning, lockout and tagout, quality checks and many repairs. In a service company you find them for commissioning, inspections and standard fault fixes.
What goes into an SOP
A usable SOP has six parts:
- Title and scope. Which job, on which machine or product. “Replace the output shaft seal on the gearbox of line 3.”
- Who does it. Required role or training.
- Safety. What to switch off, lock, wear or check before starting.
- Tools and parts. Everything to collect before the first step.
- The steps. Short, numbered, one action each, in the order they happen. A picture or a short video clip for every step where it helps.
- How to check the result. What “done” looks like. Run the machine and confirm there are no further leaks.
The steps are the part people read. Everything else exists to make the steps safe and complete.
An example: resetting a drive fault
Here is a short SOP for a common job in an electrical cabinet, written the way a technician would say it:
Reset a frequency drive after an overcurrent fault (fault F0001)
Before you start: switch off the main power at the cabinet and wait five minutes for the capacitors to discharge. Wear insulated gloves.
- Open the cabinet door and find the drive for motor M3.
- Check the motor cable connections. Press each terminal. If one is loose, tighten it.
- Switch the main power back on.
- Press the reset button on the drive. The display shows “Ready.”
- Start the motor from the control panel and watch the current for one minute. It should stay below 12 A.
If the fault comes back within a minute, stop. The problem is in the motor or the load, not in the drive. Open a work order.
That is five steps and about 100 words. Most real SOPs are longer, but the shape is the same.
Why most SOPs are not used
Ask a technician where the SOP for a job is, and you often get one of three answers: in a binder in the office, in a PDF somewhere on the network drive, or “we never wrote one, ask Jens.”
Three things kill SOPs:
- They are too long. A twelve-page document for a twenty-minute job will not be read at the machine.
- They are not where the work is. If the SOP is in the office and the job is on the floor, people work from memory.
- They go out of date. The machine gets a new control unit, the method changes, and the SOP still describes the old way. After the second wrong instruction, people stop trusting the document.
A good SOP is short, reachable from a phone at the machine, and updated the same week the job changes.
SOPs and work instructions
The terms are close. A work instruction is usually more detailed and more specific to one machine or one workstation. An SOP may cover a type of job across several machines. In practice many companies use the words for the same thing. What matters is that the document has the six parts above and that people can find it.
How to make SOPs from a video
The fastest way to write an SOP is not to write it. Film it.
An experienced technician does the job once with a phone on a stand or in a colleague’s hand, and talks while working. “Now I check the three motor terminals. This one is loose, so I tighten it to 2.5 newton metres.”
Opero takes that video and turns it into a step-by-step guide: one step per action, a frame from the video as the picture, and the spoken words as the instruction. The technician checks it, fixes anything wrong, and it goes into the knowledge base where the next person can find it from their phone, at the machine.
When the job changes, someone films it again. The SOP is updated in an afternoon instead of waiting a year for the next document review.
This is also how a company keeps the knowledge of people who are about to retire. One afternoon of filming captures more than a month of interviews.
Questions people ask about SOPs
How long should an SOP be? As short as the job allows. If a step needs a paragraph, it is probably two steps.
Who writes SOPs? The person who does the job best, with someone else checking it for safety and clarity. Not the office.
How often should they be reviewed? Every time the job changes, and at least once a year. With video it is cheap enough to do.
If you want to see a video turned into a procedure your team can follow, book a 20-minute demo.