In the world of high competition markets and businesses, understanding what practices need to be proposed and implemented to enhance their officers to use English at work successfully is essential. This research is, therefore, designed to explorethe models in using English at work for PEO (private enterpriseofficers) in Bangkok metropolitan, Thailand; and to develop the models in enhancing the PEO English at work. The sample was180officers with different positions, years of experiences,

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... n levels, and genders, from variousprivate enterprises in Bangkok, Thailand. The implemented questionnaires and semi-structured interview were analyzed using statistics programs with the hypothesis testing of 0.05 level of significant. The results revealed interesting indicators for administrators/business owners and/or pedagogical/training instructors to be serious concerned if they would like their enterprises to strive for global business success. Additionally, the implications derived from the study wereidentified. Finally, the recommendations not only for administrators/business ownersand/or pedagogical/training instructors, but also for the future research were offered.