This book is a general introduction to the structures of the different medieval Romance vernaculars most commonly known as Old or Medieval Spanish. It describes the orthography, phonetics and phonology, morphology, syntax, and vocabulary of medieval Hispano-Romance, and exemplifies these features in an anthology of texts with commentary. Dworkin's categorization of his book as a "guide" as opposed to a "grammar" is highly accurate, not in terms of what it does not cover, but in the sense that it accomplishes more than what one would expect from a grammar. In fact, Dworkin's use of the term is quite fortuitous in that it reflects the notion of a Spanish "guion" in its true augmentative sense as a 'large or comprehensive guide' rather than its more common usage as a 'script' or 'outline.' Both its accessibility and the comprehensive nature of its content make it an appealing read for a wide audience of undergraduate and graduate students, as well as scholars both within and outside of Hispanofilia.