Tabla de Contenidos:
- v.1-2. Beginners : Book One: units 1-10 - Book Two: units 11-20.
- v.3-4. Elementary: Book One: units 1-10 - Book Two: units 11-20.
- v.5-6. Lower intermediate: Book One: units 1-10 - Book Two: units 11-20.
- v.7-8. Upper intermediate Book One: units 1-10 - Book Two: units 11-20.
- Beginners: CD-ROM, DVD One: units 1-10 - CD-ROM, DVD Two: units 11-20.
- Elementary: CD-ROM, DVD One: units 1-10 - CD-ROM, DVD Two: units 11-20.
- Lower intermediate: CD-ROM, DVD One: units 1-10 - CD-ROM, DVD Two: units 11-20.
- Upper intermediate: CD-ROM, DVD One: units 1-10 - CD-ROM, DVD Two: units 11-20.