A work instruction (WI) is a document that is used to clearly define the inspection variables for a given inspection. It is designed to be used in conjunction with a procedure or standard.
A work instruction is normally issued for the following reasons:
1. To ensure that a particular task is carried out to specific requirements to improve reproducibility and reliability.
Example: If 100 items of a given component need to be tested over a period of time by numerous technicians. A WI will ensure that all technicians are using the same technique / process.
2. To be issued to Level 1 Technicians.
As per AS3998/ISO9712 Level1 technicians shall not be responsible for selecting method or technique. A Work Instruction is essentially most of the technique areas normally recorded on a record of test, pre-nominated by a Level 2 or 3 level.