The document summarizes the core principles focused on during the first week of implementing Content and Language Integrated Learning (CLIL) methodology across different educational settings. These include a primary school, secondary school, and vocational school. The main principles are developing students' language skills and confidence, integrating content and language, building on existing knowledge through scaffolding, using cooperative and authentic activities, and focusing on multiple subjects. The document also provides examples of activities that could be done in each setting during the first week to introduce CLIL, such as name games, setting learning outcomes, and reading texts related to the content topic.