Dear Simon,
Okido states it nicely.
I haven't picked out a specific example yet but the basis of using references such as Codex to validate CCPs and Critical Limits is illustrated by an extract from this link -
http://europe.ilsi.o...le/ILSIVali.pdf.
'To meet the objectives of validation it is necessary to critique (1) the supporting evidence used in the HACCP study and (2) the control measures, including monitoring and corrective actions.
1. Validation of the supporting evidence requires that evidence be provided to justify first the selection of the significant hazards and, second, the effectiveness of the proposed control measures.
Evidence supporting the selection of significant hazards may come from the scientific literature, trade associations, regulatory and legislative departments, historical data, professional bodies, or company knowledge. Evidence must be gathered for both the inclusion and the exclusion of all relevant hazards considered during the hazard analysis.
Supporting evidence is needed to show that the established target values and critical limits will adequately control the identified hazards to a level which meet company product safety requirements. This may be achieved using the same sources that were used for the selection of the hazards (see above) and by testing. Testing is the process by which proposals for control are positively tested for their effectiveness. Examples of testing include deliberate contamination, heat distribution and penetration tests, 100% incubation or inspection of production lots, and mathematical modelling of microbial growth.
2. Validation of the control measures is the reconciliation or cross-checking of the HAC'
Rgds / Charles.C