They say that the teacher is the profession that teaches all the other professions. The person who has the future in her classroom! The one who teaches the world! The world in one classroom! Different learners learn in the same classroom. Teaching in a mixed ability or a heterogeneous class is a very stressful and hard job. The world is growing day by day and the classrooms are filled with pupils who have different skills and expectations. This book is about a research that focuses on the challenges of teaching in a mixed ability class. It concentrates on the methods the teachers of a small town in Kosova use in their classroom and the pupils' opinions of learning in a mixed ability class. In addition, there are described the benefits and limitations of classes with diverse language level and possible teaching strategies and methods to be used in such a classroom.