In this paper. we developed a method to extract item-level response times from log data that are available in computer-based assessments (CBA) and paper-based assessments (PBA) with digital pens. Based on response times that were extracted using only time differences between responses. we used the bivariate generalized linear IRT model framework (B-GLIRT. https://missouriquiltcoes.shop/product-category/fabric-pens/