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...Peer reviewed article volume issue pp journal of interdisciplinary studies in education issn print online https ojed org jise how to improve the validity and reliability a case study approach catia quintao pedro andrade polytechnic institute gaya portugal fernando almeida university porto inesc tec abstract is widely used method qualitative research although defining can be simple it complex develop its strategy furthermore still often not considered sufficiently robust field because does offer well defined use structured protocols one most frequent criticisms associated with low this sense aims concisely explore main difficulties inherent process developing also attempting suggest some practices that increase construct internal external keywords methodology introduction methodologies broadly describe set strategies methods have similar characteristics each other we an interactive model data collection analysis various sources through combination seek capture subjective dimension socia...