Purpose: The purpose of the study is to firstly, determine the inter- and intra-coder reliability of a South African developed CNS and secondly, to compare the coding proficiency of amateur club rugby coaches versus an experienced coder. Methods: Five amateur club coaches coaching in the Western Province Super League with no prior experience of CNS or coding and one experienced coder participated in the study. The participants (n=6) each coded five international rugby matches and re-coded two of these matches to determine the intra-coder reliability. Results: The reliability between the different coding agreements were measured using Cohen`s kappa statistic (K). The study revealed a good inter-coder agreement for all the performance indicators (K=0.79) with the strongest agreement being for the set-pieces (K=0.93). Very good intra-coder reliability was aIso revealed for all the coders; there was a mean of K=0.82. Comparing the amateur club coach coding to the experienced coder showed a good mean agreement of K=0.77. Conclusion: There was a good agreement across the various Pis measured (mean of K=.79). Compared to studies with data generated from external companies, the agreement Is not as strong (generally K2.90) (Bradley. 2007; Larkin et al.. 2016; Liu et al.. 2017). The set-pieces, namely scrum and lineout Pls, had the strongest agreement across all coders. The nature of set-pleces allows for strong agreement due to the stoppage in play which can draw the attention of the coder and therefore increase their focus (Franks & Miller. 1986).The study concluded that the EncodeProRX is a reliable CNS that can be accurately and consistently used in amateur club rugby set-up.
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