Definitions get me into a lot of trouble.

Early in my career, I was asked to perform a “feasibility study.”

“What’s the subject?” I asked.

“An inventory system,” my boss answered.

“OK, it’s feasible,” I told him. “I guarantee it. Lots of other companies keep track of their inventories on computers, so it must be.”

More patient than most of the managers I’ve reported to in my career, he explained to me that in IS, a feasibility study doesn’t determine whether something is feasible. It determines whether it’s a good idea or not.

It turned out to be a good idea (a tremendous surprise), so next we analyzed requirements. You know what’s coming: A senior analyst asked me if the requirements were before or after the negotiation.

“What negotiation?” I asked. “These are requirements. They’re required.”

This is how I learned that we do feasibility studies and requirements analyses in part to test the validity of the requests we receive. The process would be unnecessary if we believed end-users were our customers.

At the supermarket, nobody says to a customer, “Those fried pork rinds aren’t an acceptable part of your diet!” or, “Prove you need that ice cream!” At the supermarket, wanting something and being able to pay for it are all that matter.

In IS we used to view end-users as our (internal) customers, and we figured the relationship followed from the role: If they’re our customers, our job is (as Tom Peters would say) to delight them.

End-users aren’t our customers, though. They’re our consumers – they consume our products and services but don’t make buying decisions about them. But does that really change anything, or is it just a useless distinction?

It does change things. “Customer” defines both a role and a relationship. What does “consumer” say about a relationship? Nothing. Or at best, very little.

“Consumer” defines only a role, and in the context of organizational design, role is a process concept, whereas relationship is a cultural one. (Definitions: Processes describe the steps employees follow to accomplish a result. Culture describes their attitudes and the behavior they exhibit in response to their environment.)

What should the relationship between IS and the rest of the business look like? This is one of the most continuously controversial issues in our industry. When you view it as a clash between process design and cultural cues, the reason our discussions are jumbled is more clear.

Defining the rest of the business as our consumers frees us to define whatever relationship works the best. As with my inventory system, every highly successful result I’ve ever seen in IS has been the result of an open collaboration between IS and end-users, with authority shared and the dividing line between the two groups obliterated.

Yet many of my colleagues and much of the correspondence I receive on the subject still advocate a hard dividing line between the two groups, with formally documented “requirements” defined by a small group of end-users and the authority for “technical” decisions reserved for IS.

Of course, purely technical decisions are few and far between these days. What brand of NIC should you buy? OK, that’s a technical decision, but even something as seemingly technical as choosing a server OS places constraints on business choice. Or, looking at the opposite end of the process, selecting a business application limits IS’s choice of operating system, sometimes to a single one.

Trying to partition responsibilities to preserve the prerogatives of one group or the other leads to nothing but bad results. “You have to do this for me because I’m your customer,” and “You can’t do that because it violates our standards,” are two sides of the same counterfeit coin.

There are few purely technical or purely business decisions anymore. Since form follows function, you should strive for a relationship that recognizes this fact. What kind of relationship should you have with your consumers? One that emphasizes joint problem-solving and decision-making, and working together in a collaborative environment.

Or, in a word, “partnership.”

Customers make buying decisions. Consumers use products and services. Sometimes they’re the same person. Sometimes they aren’t.

By differentiating between customers and consumers you can explain a lot of otherwise baffling phenomena in business, like why professional sports teams don’t care that strikes and demands for new stadiums (stadia?) have driven the public beyond mere apathy to alpha-state levels. Their major customers are the networks; fans, for the most part, are consumers.

It also explains the poor product quality and “customer” service of many software companies: Software selection is a strategic decision made by IS leadership or the chief technical officer, so when end-users and technicians experience problems and call for support they can’t threaten to take their business elsewhere — it isn’t their decision.

(This distinction, by the way, appears to be an original insight — much to my astonishment, nobody seems to have pointed it out before. If you were my customer instead of my consumer, it could turn me into a wealthy man.)

This distinction is useful inside, as well as outside, the company: Understanding the difference between your internal consumers — the people who make use of the technology you provide to the enterprise — and your internal customers will help you become a more effective leader, and help your career as well.

A recent column pointed this out. Your internal customers aren’t your consumers, they’re the people who approve your budget and who control your career. Some readers weren’t too happy with this analysis: They prefer to eliminate the idea of internal customers altogether. Everyone in IS, in their view, should focus on the connection between their work and external customers (and, presumably, external consumers, too).

This is a position advocated many times in this space: Everyone in IS, and in fact, every employee in the company, should always be aware of how their efforts translate to value for external customers.

The two positions aren’t in conflict, though. They’re complementary, or at least they can be, although keeping all of the connections straight can be a challenge sometimes.

When making decisions, it’s worthwhile to look at the world from more than one perspective. One perspective is that of mission and purpose — what you are trying to accomplish. From this perspective, it’s important to understand your connection to external customers, to provide context for your actions and decisions. IS works best when it relates to the rest of the company as an active partner rather than as a passive order-taker or independent service provider, and to be an active partner you need to participate in interactive discussions about how to achieve business goals. “How can we more effectively attract and retain customers together?” is a better question than, “How can we help you?”

A different, but equally valid, perspective is your responsibility to be politically effective. Even in healthy companies, every individual starts with different premises, experiences, personal and professional goals, and priorities … in short, a unique world view. Politics is the art of moving forward in the face of these differences. With technology pervading most businesses, every business decision leads to new or changed, and always conflicting technical requirements and priorities, so you operate in a highly political environment.

Why should you view the people who control your budget as your internal customers? Because that’s political reality. By definition they are your customers, and if you don’t treat them that way, they won’t make the right buying decisions about your products and services (they won’t approve your budget).

Then, most important of all, there’s a third perspective: your career. You personally have customers, and they’re also internal. They’re the people who approve your raises, bonuses, and promotions.

If you’re lucky, helping the business attract and retain external customers will make your personal internal customers happy. If you aren’t so lucky … well, they’re internal, but they’re still your customers.

It’s up to you to decide how you want to treat them.