For learners to be individuals equipped with the 21st-century skills when they start business life after graduation, they must be able to gain these skills during their education. However, due to their nature, it's not possible for students to acquire these skills under a specific course. For these skills to be achieved, they must be integrated across all curricula. In this study, an evaluation was conducted to see whether various countries incorporate the 21st-century skills in their curricula, how these skills are applied, and how these skills should be handled in their curricula. Within the scope of this research, the curricula applied in Australia, New Zealand, Canada, England, Ireland, and Turkey were examined. When the 12 skills defined by the P21 platform are considered, it can be seen that all skills are interconnected and that one cannot fully exist without the other. It can be said that starting to gain these skills, which are required by the 21st-century professions and which employers expect from graduates, from an early age it is important for individuals to be properly and fully prepared for the future. In accordance with the 21st-century expectations, evaluations, educational materials, teaching methods, professional growth opportunities, and learning environments should all be synchronized to create a supportive framework that generates the 21st-century results for contemporary students. [This paper was published in: "EJER Congress 2023 International Eurasian Educational Research Congress Conference Proceedings," Ani Publishing, 2023, pp. 97-126.]