  To complement the neutrino-physics lectures given at the 2011 International
School on Astro Particle Physics devoted to Neutrino Physics and Astrophysics
(ISAPP 2011; Varenna, Italy), at the 2011 European School of High Energy
Physics (ESHEP 2011; Cheila Gradistei, Romania), and, in modified form, at
other summer schools, we present here a written description of the physics of
neutrino oscillation. This description is centered on a new way of deriving the
oscillation probability. We also provide a brief guide to references relevant
to topics other than neutrino oscillation that were covered in the lectures.
