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Collaborative lesson planning (CLP) is a key component of teachers’ professional development that responds to students’ ever-increasing learning needs. This study aimed to develop and validate an instrument to evaluate teachers’ CLP practices. Guided by the SECI (socialisation, externalisation, combination, and internalisation) knowledge-creation model of Nonaka and Takeuchi (1995), items assessing CLP practices were developed. To validate the CLP scale, we analysed data from 540 primary and secondary school teachers in Hong Kong. Exploratory factor analysis on a random half of the sample suggests a four-factor solution that supports the SECI model. A confirmatory factor analysis and multidimensional Rasch analysis on the remaining half of the sample confirmed the four-factor structure. Both analyses support the dimensionality of the four-factor model, rating scale effectiveness, and item fit statistics …