The major problems that retailers highlight in their negotiations with potential small scale providers and especially processor are assurance of supply and quality.
While large retailers often have quality management requirements that dictate systems to which the small scale processor must comply, the processor also needs a general background and understanding of quality and quality assurance. In addition, if they are selling to smaller retailers or directly to the consumer they require this information to ensure the quality and safety of their products on which their business depends.
The FAO has published a document on Quality Assurance in small scale rural food industries written by Fellow, Axtel and Dillion.
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While this book was written in 1995, it is still essentially valid and is recommended because of its accessibility to small rural entrepreneurs.
The contents page of the document illustrates its scope.
It can be viewed at http://www.fao.org/docrep/V5380E/V5380E00.HTM but unfortunately is not directly downloadable. SAFPP is approaching FAO to try and identify more practical ways of providing access to this valuable document to entrepreneurs in rural areas where access to ICTs is constraining.