Behaviouralists have developed a sophisticated method for assessing changes in behaviour that depend on accurate measurement of behaviour. Direct observation of behaviour is traditionally one of the carriers of behavioural measurement. Therefore, researchers need to address psychometric properties, such as the .B the Interobserver Agreement, of observational measures to ensure a reliable and valid measurement. Of the many indices of the Interobserver agreement, the percentage of the agreement is the most popular. Its use persists despite repeated reminders and empirical evidence that suggests that it is not the most psychometric statistic that determines interobserver agreement because of its inability to take into account chance. Cohens Kappa (1960) has long been proposed as a more psychometric statistic for the evaluation of the Interobserver agreement. Kappa is described and calculation methods are presented. Fiss, J. L. (1971). Measure of the scale rated correspondence between many advisors.
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