Grammatica italiana più is a reference grammar book that can be consulted in any order you want and that adapts to the various levels, the various types of students, the various learning paths. Almost all chapters have a section (with exercises) for levels A1-A2, completed by a summary that brings together the main contents, and one for levels B1-B2. The B1-B2 levels, dealing with complex grammatical topics, are descriptive.