Amazon.com description: Product Description: Think of TLE Online lessons as electronic labs that upgrade any BCA/iLrn Tutorial. TLE Online Lessons introduce and explore key concepts. BCA/iLrn tutorials reinforce those concepts with unlimited practice. Each of the 15 TLE lessons, scheduled one per week in a traditional semester course, covers the key concepts of the course. With the opportunity to explore these core concepts interactively at their own pace, students are solidly prepared for the work of the traditional course. Because they are better prepared, they enjoy the class more and, consequently, perform better in the course overall. When they perform better in the course overall, they are better prepared to tackle the next level of mathematics that awaits them.