Customer Service Procedure

There will be some changes, although the procedure is applicable to inhouse and external clients. Depending on the organizational structure, there may be few or more changes. Simply go over the procedure step by step and customize for your context. For example, a legal contract is not required if the laboratory is part of the same legal structure as the mine /production.  

Either way the clients (internal or external) requirements should be known, agreements and deviations presented in writing for inhouse clients as well.  In most cases the way you record the evidence and results, can be simplified.

Have a look at my response to a similar topic at https://community.advisera.com/topic/iso-17025-for-internal-quality-control-laboratory/

You can also get a detailed description of the ISO 17025 Documentation Toolkit and free preview, at https://advisera.com/17025academy/iso-17025-documentation-toolkit/