Englisch in der Praxis (könyv+ MP3 CD)

begins with a long passive phase of only reading and listening, and eventually adds active exercises. Most books contain around 100 lessons, with the active phase starting on Lesson 50. The word Assimil comes from assimilation.
Several different series are published:
With Ease series, which teach basic rules of grammar and a vocabulary of 2000-3000 words;
Perfectionnement series, which teaches more advanced idiosyncrasies and idioms of the target language;
Business series, which focuses on vocabulary related to international business;
Idioms series, which teaches common idioms;