- Bun go Barr 4 is for use in Fourth Class.
- Units are introduced either by means of poster-style two-page-spreads or by two pages of comic-strip stories. Each unit includes solid reading, writing, comhra, vocabulary development and grammar presented in a fresh, methodical, pupil-friendly approach.
- Revision is built in through monthly Suil Siar sections and a summary of grammar and vocabulary used is given at the end of the book.
- A new feature of this book is the introduction of a full-length drama dealing with An Nollaig.