Most audio courses (like Pimsleur or Michel Thomas) are linear. You listen, repeat, move on. The uses a different architecture. Each disc is designed as a "digital classroom."
If you buy a used set, check CD 1 for scratches, as the software disc is the hardest to replace. bbc english plus interactive 30 cds hot
The defining feature of this package was its move away from the "Listen and Repeat" methodology of the cassette era. "Interactive" in this context meant utilizing the CD-ROM format to its limits. Most audio courses (like Pimsleur or Michel Thomas)
As this course was released over 15 years ago, the physical "paper" components are typically found through: Second-hand Marketplaces : Listings often appear on sites like Mercado Livre Milanuncios Each disc is designed as a "digital classroom
Modern apps are better for casual learners or tourists. The BBC 30-CD set is superior for serious students who want a deep, structural understanding of the English language, specifically British English.