Any Foundations B Student Workbook may be used with any Foundations B Teacher's Manual. The edition change does not affect compatibility, but it changes the location of the Readers.
Edition History: Foundations B Student Workbook
Edition 1: Published in 2013. 272 pages. Includes the Foundations B Readers as tear-outs at the back.
Edition 2: Published in 2015. 238 pages. Workbook activity pages are unchanged, but Foundations B Readers are now sold separately as a set of individually bound paperback books, rather than printed in the back of the workbooks as tear-outs.