Chapter 3 of my book “Spain: What Everyone Needs to Know”, published by Oxford University Press, answers 13 key questions about the Spanish transition to democracy, including the political process, the protagonists, the role of King Juan Carlos, the media, social mobilization and the new constitution. It has been placed on the website of the Fundación Transición Española.
http://www.transicion.org/En/destacados/LibroChislettEn.php