Why can't I find the words process audit in ISO 9001? Should I be looking someplace else?
Yes.
The requirements of the standard have been laid out according to the high level structure, which means that there are clauses and the writers put stuff in the clause holders. That does not mean they are exclusive.
The nature of the system is you have to relate the requirements in meaningful ways, like relating them to your system.
The standard is laid out with 'threaded' requirements. Process approach is one. I have done this with AS9100 Rev. D and failed to highlight the differences, so I challenge you to check my work against ISO 9001:2015. Green text is the paraphrased standard, my comments in black.
[FONT="]0.1 General[/FONT]
[FONT="]The process approach enables an organization to plan its processes and their interactions.[/FONT]
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[FONT="]The PDCA cycle enables an organization to ensure that its processes are adequately resourced and managed, and that opportunities for improvement are determined and acted on.[/FONT]
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[FONT="]We plan, do (perform), check (inspection and audit), and act (corrective action) our processes.
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[FONT="]0.2 Quality Management Principles -Process Approach
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[FONT="][FONT="][FONT="]The process approach is one of the seven principles.
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[FONT="]0.3.1 Process Approach: General[/FONT]
[FONT="]Understanding and managing interrelated processes as a system... This approach enables the organization to control the interrelationships and interdependencies among the processes of the system...[/FONT]
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[FONT="]The process approach involves the systematic definition and management of processes, and their interactions, so as to achieve the intended results... Management of the processes and the system as a whole can be achieved using the PDCA cycle (see 0.3.2) with an overall focus on risk-based thinking (see 0.3.3) aimed at taking advantage of opportunities and preventing undesirable results.[/FONT]
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[FONT="]4.4.1 AQMS and its Processes[/FONT]
[FONT="]The organization shall determine the processes[/FONT]
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This is a step that if organizations[FONT="][/FONT] do not consider carefully will result in an ineffective system
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[FONT="] needed for the quality management system and their application throughout the organization, and shall:[/FONT]
[FONT="]a. determine the inputs required and the outputs expected...[/FONT]
[FONT="]b. determine the sequence and interaction of these processes;[/FONT]
[FONT="]c. determine and apply the criteria and methods (including monitoring, measurements and related performance indicators) needed to ensure the effective operation and control of these processes;[/FONT]
[FONT="] [/FONT][FONT="]g. evaluate these processes and implement any changes needed to ensure that these processes achieve their intended results;[/FONT]
[FONT="]Internal Audits can be considered performance indicators, no? If not, how else? Ask the process owner? One of the other seven management principles is Evidence Based Decision Making.[/FONT]
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[FONT="]5.1.1 Leadership and Commitment: General[/FONT]
[FONT="]Top management shall demonstrate leadership and commitment with respect to the quality management system by:[/FONT]
[FONT="]d. promoting the use of the process approach and risk-based thinking;[/FONT]
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[FONT="]5.3 Organizational Roles, Responsibilities and Authorities[/FONT]
[FONT="]Top management shall assign the responsibility and authority for:[/FONT]
[FONT="]a. ensuring that the quality management system conforms to the requirements of this International Standard;[/FONT]
[FONT="]b. ensuring that the processes are delivering their intended outputs;[/FONT]
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[FONT="]6.1.2 Planning: Actions to Address Risks and Opportunities[/FONT]
[FONT="]The organization shall plan: [/FONT]
[FONT="]a. actions to address these risks and opportunities; [/FONT]
[FONT="]b. how to: [/FONT]
[FONT="]1. integrate and implement the actions into its... processes [/FONT]
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[FONT="]8.1 Operational Planning and Control [/FONT]
[FONT="]The organization shall plan, implement, and control the processes (see 4.4) needed to meet the requirements..., and to implement the actions determined in clause 6, by:[/FONT]
[FONT="]b. establishing criteria for:[/FONT]
[FONT="]1. the processes; [/FONT]
[FONT="]2. the acceptance of products and services;[/FONT]
[FONT="]d. implementing control of the processes in accordance with the criteria;[/FONT]
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[FONT="]9.2.2 The organization shall: [/FONT]
[FONT="]a. plan, establish, implement, and maintain an audit program(s), which shall take into consideration the importance of the processes concerned, changes affecting the organization, and the results of previous audits;[/FONT]
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[FONT="]I was upset when I read this clause. The drafters FAILED miserably (IMO) to establish the very heart of your question, necessitating all of this explanation. A more strongly worded statement about auditing your processes would have helped.[/FONT]
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[FONT="]A little historical perspective, ISO9001:1994 was not process-based, and it was not beneficial for organizations that audited the clauses. It didn't related to "what they did" (i.e. processes). ISO 9001:2000 introduced the concept, and ISO 9001:2008 tried to re-enforce the concept.
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[FONT="]By adding the Process Approach to both the seven management principles and Leadership and Commitment, perhaps the drafters felt they had established their point.
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[FONT="]9.3.2 Management Review: Inputs[/FONT]
[FONT="]The management review shall be planned and carried out taking into consideration:[/FONT]
[FONT="]c. information on the performance and effectiveness of the quality management system, including trends in:[/FONT]
[FONT="] 3. process performance and conformity of products and services;[/FONT]
[FONT="] 6. audit results;[/FONT][FONT="][/FONT]
Audit results and objective results are often used to gage process performance and conformity of the system.
I hope this makes it a little more clear!