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• Green IT has become a vital asset for organizations in their pursuit of sustainability, but they are still disoriented when implementing improvements in this area. • It is essential to perform improvement plans for Green IT processes on a regular basis in order to adapt them to constant changes in the business and refine them to obtain more effective and efficient results. • The ISO/IEC TR 33014 standard can be applied as a useful guide for Green IT process improvement, obtaining more reliable results in this regard. Sustainability has become an important engine of change for both society and organizations. The latter have realized that sustainability goes far beyond preserving the environment and the implementation and improvement of sustainable practices is helping them to be increasingly effective and efficient in their processes and operations. One of the business areas that is evolving the most and taking on the most relevance regarding sustainability is Information Technology (IT). The well-known as Green IT not only defends the idea of sustainable IT, but also of using IT to help other areas to be sustainable. However, organizations are still disoriented regarding Green IT, since they do not have the frameworks and/or standards to properly implement and improve Green IT in their processes and operations. That is why this study addresses the problem of improving Green IT processes by applying the ISO/IEC TR 33014 standard to this area, based on a case study in a Colombian organization. The results and findings obtained through this application demonstrate the usefulness and importance of conducting improvement plans for Green IT processes when best practices are implemented in this regard. Likewise, following standards such as the ISO/IEC TR 33014 for the improvement of processes help to obtain more reliable results, as well as more effective and efficient practices and processes. [ABSTRACT FROM AUTHOR]