Peter and Waterman were not doing a PhD thesis in a university that they had to validate their methodology. No, they did not need any interviews either. All they needed was an open mind, and open eyes. 

Their observations are sufficient to make the main proposition that the 7 S's do have to be in harmony with each other. Makes sense.

Singing a company song together, having free coffee, allowing dogs to come with their owners, all different, but in the abstract the same thing - Company's shared values - all what counts.

A shared value for some Companies is honesty, for others profit at any cost. Bombardier is latter.