You may also want to consider looking at a schedule for prerequisites depending on the risk to your products:
Prerequisites are described in ISO 22000 Clause 7.2.3:
When selecting and/or establishing PRP(s), the organization shall consider and utilize appropriate information [e.g. statutory and regulatory requirements, customer requirements, recognized guidelines, Codex Alimentarius Commission (Codex) principles and codes of practices, national, international or sector standards].
NOTE Annex C gives a list of relevant Codex publications.
The organization shall consider the following when establishing these programmes:
a) construction and lay-out of buildings and associated utilities;
b) lay-out of premises, including workspace and employee facilities;
c) supplies of air, water, energy and other utilities;
d) supporting services, including waste and sewage disposal;
e) the suitability of equipment and its accessibility for cleaning, maintenance and preventative maintenance;
f) management of purchased materials (e.g. raw materials, ingredients, chemicals and packaging), supplies (e.g. water, air, steam and ice), disposals (e.g. waste and sewage) and handling of products (e.g. storage and transportation);
g) measures for the prevention of cross contamination;
h) cleaning and sanitizing;
i) pest control;
j) personnel hygiene;
k) other aspects as appropriate.
You may want to audit things like personnel hygiene and measures for the prevention of contamination more frequently.
Regards,
Tony