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International Seed Testing Association
International Seed Testing Association
Richtiarkade 18
8304 Wallisellen, CH
+41 44 838 60 00
International Seed Testing Association

Seed Health Toolbox

Langton-accordance and Concordance Tool

This tool has been set up by S Langton, who kindly accepted it to be published on ISTA web, based on his publication “Analysing collaborative trials for qualitative microbiological methods: accordance and concordance", published in International Journal of Food Microbiology 79 (2002), 175– 181. It is very useful for calculating accordance (repeatability) and concordance (reproducibility) for qualitative results obtained during CT and PT.

Download the excel tool for testing homogeneity of samples for seed health

Note: In case the formulas in the excel file should not work, please try to modify the delimiter symbols (comma/point) which can be changed in Region and language/ other parameters/decimal symbol. If you should still have problems with the tool or other questions, please contact:

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