When Should we Use the Extended Marketing Mix (7Ps) instead of the Traditional Marketing Mix (4Ps)?
Basically you could just go away with the 4Ps even when it comes to the services, however just having those 7Ps in mind is a good idea, but its not really something to focus on.
The Physical Evidence falls into the Place, since there are no real distribution when it comes to services.
People... well the marketing mix is made to satisfy people's needs and wants so it could even be in the 4Ps, why adding it in the 7Ps? It's just like bolding it to make sure you get that right but still People are involved in the whole process one way or another.
Process: Ok that is probably the only one that deserves to be added on the 4P of the "normal" marketing mix.
So yeah, once again, is there a real need of those 7P?
ps: "Prior Preparation Prevents Piss Poor Performence" is still the best 7P ~!