Challenge: in the context of the Hotel Industry, can you give me a clear definition of Attribute-based selling? Typically, in an attempt to answer a question like this and in times like these, you might be falling into either of the following categories: you know what ABS is, but barely any hoteliers has been using it, so you quite don't trust; you are not sure what's the real difference between attribute-based selling and ancillary services ; you quite don't know what it is