Since 2010, annually updated data on instruction time has been available on the Eurydice website. Given the great similarities between the two data collections, the Organisation for Economic Co-operation and Development (OECD) and Eurydice networks have decided to produce one single data collection tool and conjointly manage the data collection on instruction time. This common work avoids inconsistencies and overlaps between similar sets of internationally comparable data. This publication provides information on instruction time in various forms: national data sheets, indicators and country specific notes. Part I defines the scope of the document and offers relevant definitions. Part II contains a comparative analysis that covers various instruction time indicators. Part III begins with a reading guide to the diagrams (national data sheets). This guide briefly explains what the diagrams show and how to read them, and lists the acronyms and abbreviations they use. The diagrams are located in Part III Section 2 (Instruction time by country), and Part III Section 3 (Instruction time by subject). Part III Section 4 contains an appendix to the diagrams, that includes diagrams on instruction time for subjects or curriculum categories that are only present in a small number of curricula in European countries (i.e. instruction time for the third and the fourth foreign languages (languages 4 and 5) as compulsory subjects and for the non-compulsory curriculum). Part III Section 5 provides country specific notes complementary to the information provided in the diagrams. [For the 2013-2014 report, see ED593446.]