Reading is considered as one of the most challenging and difficult abilities in learning a foreign language which also serves as a basis for developing other competences. The monograph presents and discusses in detail a novel multi-stage research study on the acquisition and development of reading comprehension skills in trilingual advanced learners. It examines the use of reading strategies in two experiments involving Polish students of English and German, and the impact of strategic training in one foreign language on its autonomous employment in the next one. The obtained results are subject to a thorough statistical analysis which allows for drawing significant conclusions concerning the process of reading comprehension in trilingual advanced learners.