Background
In 2014, FEWS NET joined an effort with FAO and WFP to define and meet each institution’s product coding needs within the general bounds of a common product coding structure that would guarantee a high level of consistency and comparability among the codes used by these organizations to classify crop production and monitor food prices. In a collaborative report published in 2014 by the UN-based Food Security Information Network1, a common framework and agreement was reached about product coding.
 
  
  
 Code structure
FEWS NET product codes are derived from existing CPC V2 codes and built in a consistent manner consisting of three parts:
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  Each code begins with a one-character alpha-code prefix that FEWS NET uses to split its product and service codes into 4 distinct sub-groups2: - 
    R: “raw” un-processed3 agricultural product 
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    L: animal/livestock product 
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    P: manufactured or “processed” product 
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    S: service product 
 
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  This is followed by a 2- to 5-character numeric code taken directly from the CPC . 
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  FEWS NET appends a two-character “alpha” code (e.g. “AA”) to the end of each to allow for easy differentiation between sub-types of products. 
Example
The FEWS NET code for wheat grain, with no other identifying crop information, is R01112AA:
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    R: It is a “raw” un-processed agricultural product 
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    01112: The CPC code for wheat grain is “01112”. The “011” portion of the code refers to a cereal, in general. The fourth character, “1,” refers to wheat. The fifth character, “2,” means this cereal grain is used for consumption. A final character of “1” is reserved to indicate a cereal grain intended for planting purposes. 
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    AA: For R01112, AA is used for the generic “wheat grain, other.” A different set of suffix letters is used for soft red winter wheat (AB), einkorn wheat (AJ), etc. 
This modified product and services coding system based on a well known standard allows FEWS NET to:
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  Preserve a link between local product names and descriptions and a more global classification of products, allowing appropriate terminology to be used at each level of discussion/investigation. 
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  Recognize, group, and distinguish between specific products that play a role in the food security status of a population group or geographic area. 
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  Differentiate specific crop plants from others on the basis not only of genetic features but also non-genetic features, often locally identified (taste, color, smell, mouth-feel, health benefits, preparation practices, market preferences, etc.). 
[1] “Review of Global Food Prices Databases: Overlaps, Gaps and Opportunities to Improve Harmonization”, Food Security Information Network, December 2014
[2] The alpha-numeric code at the beginning of the FEWS NET-derived CPC code serves also to avoid losing the initial “0” which begins many CPC V2 crop codes, when they are used in Excel.
[3] Un-processed crops are meant to refer to the crop plant, as it comes from the field, with no other processing applied to it. Nevertheless, “drying” a crop is not considered a processing operation. The “de-husking” of rice is another notable processing practice which is not considered a “processing” operation.
