Where the obligations are different.
A hospice, a housing association and a water utility are all buying, but under different rules, different scrutiny and very different constraints. The commercial approach has to reflect that.
Beyond these five
Charities, education, professional services and manufacturing come up regularly too. The five above are simply where the regulatory and commercial differences are sharpest, and where the sector knowledge changes the approach most.
If your environment is not listed, the disciplines still apply. Say what you are dealing with and we will tell you whether it is something we should be involved in.
Which one of these are you buying in?
Sector shapes almost everything about a commercial approach: the route, the timetable, the evidence and what a good outcome even looks like. Start there and the rest of the conversation is quicker.