Because of the large variety of food and feed products, the horizontal method described in this document may not be appropriate in every detail for certain products. In this case, different methods, which are specific to these products may be used if absolutely necessary for justified technical reasons. Nevertheless, every attempt will be made to apply this horizontal method as far as possible. 

The main changes, listed in the foreword, introduced in this document compared to ISO/TS 21872- 1:2007 are considered as major (see ISO 17468). 

When this document is next reviewed, account will be taken of all information then available regarding the extent to which this horizontal method has been followed and the reasons for deviations from this method in the case of particular products. 

The harmonization of test methods cannot be immediate and, for certain groups of products,International Standards and/or national standards may already exist that do not comply with this horizontal method.It is hoped that when such standards are reviewed they will be changed to comply with this document so that eventually the only remaining departures from this horizontal method will be those necessary for well-established technical reasons. 

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