The Global Engineers Languages and Skills (GELS) framework, developed as a language-neutral framework of engineering-specific communication skills, was adapted in 2023 for Japanese to address the language’s unique linguistic and cultural features. Adjustments included subdividing beginner levels, adding a guideline for learning the complex writing system, delaying the learning of specialized vocabulary to match the learner’s kanji proficiency, and aligning communication skills with Japanese norms, such as prioritizing harmony and indirectness in interactions. These changes ensure the Japanese GELS framework reflects Japanese learning contexts and supports learners’ progress effectively. This report advocates for language-specific frameworks for Language for Specific Purposes (LSP) that go beyond English-centric models, addressing diverse linguistic and cultural needs and thereby enhancing engineers’ intercultural competence, critical thinking, and diversity management. This report also underscores the need for ongoing updates to frameworks to reflect technological and pedagogical advancements and calls for international collaboration among teachers to promote multilingual awareness. By integrating the Japanese version, the GELS framework expands its scope, better preparing engineers for diverse global environments.