The aim of the research discussed here was to understand computer-aided software engineering (CASE) tool usage in Taiwan. Through a literature review, we developed two questionnaires – one for general respondents, the other for teachers and CASE agents. After pre-testing, 786 questionnaires were mailed out and 226 effective responses were obtained after two follow-up letters. Factor analyses were used to condense factors from `severity of critical problems in system development', `severity of perceived problems in CASE usage', `attitude toward CASE' and `CASE implementation success determinants'. Several external variables were considered in exploring their possible influence as well as the attitude and organizational features of the organizations that successfully used CASE. Path analyses were used to test an attitude model of CASE adoption and implementation success determinants. The results show that `the perceived problems in CASE tools' had no statistically significant influence on `attitude toward CASE' and very little influence on `perceived CASE improvement for system development critical problems'. In addition, we found that `methodology use' (including the usage before CASE adoption and consistency with the methodology supported by CASE) was the only statistically significant CASE implementation success determinant. Using only a `methodology use' variable could provide a way to discriminate the successful adopter from relatively unsuccessful adopter with a 75% correct classification rate.