When Ive looked at their US sites I think one of them did alledgly adapt the others idea.
However there is nothing new in Marketing so they might have adapted Dale Carnigies ideas who adapted Frank Betger etc
Where I do think these people are clever is that they put in the extra trist and turns that make them work.
Plus you never here reports on the results.
Ie I put out 5000 Howard Partrige style leaflets I got xxxx business at xxx a square foot
Or I sent 500 Howard Partridge style faxes after checking with Fax prefrence service.
Targeted at achieved xxx result
In other words how do we know Howard Partridge ideas work better than Paul Elliots, Mike Hallidays. etc or any other top cleaner on the boards.