Lecture 1: The S-matrix of two-dimensional integrable QFTs and the Zamolodchikov-Faddeev algebra (Monday, January 13, 2pm) Lecture 2: S-matrix bootstrap, "CDD" factors and Bethe-Yang equations. (Tuesday, January 14, 2pm) Lecture 3: Towards finite-volume and finite-temperature: Luescher corrections and Thermodynamic Bethe Ansatz. (Wednesday, January 15, 2pm) Lecture 4: The "mirror model" and the finite-volume spectrum from the mirror Thermodynamic Bethe Ansatz. (Thursday, January 16, 2pm) All lectures are at the CUniverse office (floor 6 of Anyamanee building on Chula campus)