Before we actually construct the long exact sequence of Lagrangian Floer homology groups, we will talk about its main ingredient : a Dehn twist along an Exact Lagrangian sphere L. We will use a notion of "exact Lefschetz fibration" to depict it and if time permits, we will also talk about vanishing cycle in the exact Lefschetz fibration. (lunch: 12:00 - 14:00, break: 15:20 - 15:40)