The document introduces the CEF-ESTIM Grid, a tool designed to help language teachers estimate the level of texts, activities, competencies, and overall tasks according to the Common European Framework of Reference for Languages (CEFR). The grid provides a framework to describe class materials and activities and determine their estimated difficulty level based on CEFR levels. It is intended to help teachers plan lessons and align their materials with the CEFR in a flexible manner. The document explains how to use the grid and associated online resources, which include sample analyses, a glossary, and links to related projects applying the CEFR.