Standard Operating Procedure

A Standard Operating Procedure (SOP) is a written set of instructions for a specific, recurring task. It documents the approved and required method for completing the task safely and consistently. The goal is to reduce process variation and ensure quality, regardless of who performs the job.

On the shop floor, operators use SOPs for activities like machine setup, calibration, cleaning, and quality inspection. For example, an SOP for a changeover on a bottling line would detail every step. It would list draining the previous product, cleaning the tanks, changing labels, and adjusting the filler heads. This ensures each changeover is performed the same way every time.

SOPs are important for several reasons. They are essential for training new employees, providing a clear reference for correct procedures. They also help maintain safety standards by outlining required personal protective equipment (PPE) and safe handling practices. In regulated industries, SOPs are necessary for compliance with standards like ISO 9001 or Good Manufacturing Practices (GMP).

Manufacturers implement SOPs by first observing and documenting the current best practice for a task. This often involves working with experienced operators. The documented steps are then reviewed, tested, and approved by supervisors and quality managers. Approved SOPs are made accessible to employees, either in physical binders at workstations or digitally on tablets or terminals.