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ISO/IEC 17024:2003 is an International Standard which sets out criteria for an organization's certification program for individual persons.
ISO/IEC 17024:2003 
Released in 2003, ISO/IEC 17024 is designed to harmonize the personnel certification process worldwide. In the European Union ISO/IEC 17024 replaced EN 45013 (1989), which was published in the UK as BS 7513:1989.
The issues that ISO 17024 tackles can be summarized as
- Defining what it is you examine (the competencies)
- Knowledge, skills and personal attributes
- Examination must be independent
- Examination must be a valid test of competence
where competency is typically described as “the demonstrated ability to apply knowledge, skills and attributes”.
ISO/IEC 17024:2012 
The ISO/IEC 17024:2012 standard has been updated and is published in July 2012.
Each accreditation body provides various levels of guidance around compliance and the implementation of ISO 17024. The following is a non-exhaustive list of the more in-depth references:
IAR Accreditation Services, LLC (USA) 
American National Standards Institute (ANSI) 
- Overview of Personnel Certification *Forms and Guidance Documents related to accreditation under ANSI/ISO/IEC 17024
- Directory of Accredited Personnel (ANSI/ISO/IEC 17024) Certification Bodies
International Accreditation Service (IAS) 
- Overview of IAS Accreditation of Personnel Certification Bodies under ISO/IEC 17024
- IAS Accreditation Criteria - AC474
- Documents related to AC474 accreditation to ISO/IEC 17024