https://www.coe.int/en/web/common-european-framework-reference-languages

Professional development for teachers

https://www.britishcouncil.org/school-resources/develop-skills

 

https://elt.oup.com/teachersclub/subjects/professionaldevelopment/?cc=nl&selLanguage=en

 

https://www.cambridgeinternational.org/support-and-training-for-schools/professional-development/courses/