Market segmentation is widely defined as being a complex process consisting in two main phases: - identification of broad, large markets - segmentation of these markets in order to select the most appropriate target markets and develop Marketing mixes accordingly.

Everyone within the Marketing world knows and speaks of segmentation yet not many truly understand its underlying mechanics, thus failure is just around the corner. What causes this? It has been documented that most marketers fail the segmentation exam and start with a narrow mind and a bunch of misconceptions such as "all teenagers are rebels", "all elderly women buy the same cosmetics brands" and so on. There are many dimensions to be considered, and uncovering them is certainly an exercise of creativity.

The most widely employed model of market segmentation comprises 7 steps, each of them designed to encourage the marketer to come with a creative approach.

STEP 1: Identify and name the broad market You have to have figured out by this moment what broad market your business aims at. If your company is already on a market, this can be a starting point; more options are available for a new business but resources would normally be a little limited.

The biggest challenge is to find the right balance for your business: use your experience, knowledge and common sense to estimate if the market you have just identified earlier is not too narrow or too broad for you.

STEP 2: Identify and make an inventory of potential customers' needs This step pushes the creativity challenge even farther, since it can be compared to a brainstorming session.

What you have to figure out is what needs the consumers from the broad market identified earlier might have. The more possible needs you can come up with, the better.

Got yourself stuck in this stage of segmentation? Try to put yourself into the shoes of your potential customers: why would they buy your product, what could possibly trigger a buying decision? Answering these questions can help you list most needs of potential customers on a given product market.

STEP 3: Formulate narrower markets McCarthy and Perreault suggest forming sub-markets around what you would call your "typical customer", then aggregate similar people into this segment, on the condition to be able to satisfy their needs using the same Marketing mix. Start building a column with dimensions of the major need you try to cover: this will make it easier for you to decide if a given person should be included in the first segment or you should form a new segment. Also create a list of people-related features, demographics included, for each narrow market you form - a further step will ask you to name them.

There is no exact formula on how to form narrow markets: use your best judgement and experience. Do not avoid asking opinions even from non-Marketing professionals, as different people can have different opinions and you can usually count on at least those items most people agree on.

STEP 4: Identify the determining dimensions Carefully review the list resulted form the previous step. You should have by now a list of need dimensions for each market segment: try to identify those that carry a determining power.

Reviewing the needs and attitudes of those you included within each market segment can help you figure out the determining dimensions.

STEP 5: Name possible segment markets You have identified the determining dimensions of your market segments, now review them one by one and give them an appropriate name.

A good way of naming these markets is to rely on the most important determining dimension.

STEP 6: Evaluate the behavior of market segments Once you are done naming each market segment, allow time to consider what other aspects you know about them. It is important for a marketer to understand market behavior and what triggers it. You might notice that, while most segments have similar needs, they're still different needs: understanding the difference and acting upon it is the key to achieve success using competitive offerings.

STEP 7: Estimate the size of each market segment Each segment identified, named and studied during the previous stages should finally be given an estimate size, even if, for lack of data, it is only a rough estimate.

Estimates of market segments will come in handy later, by offering a support for sales forecasts and help plan the Marketing mix: the more data we can gather at this moment, the easier further planning and strategy will be.

These were the steps to segment a market, briefly presented. If performed correctly and thoroughly, you should now be able to have a glimpse of how to build Marketing mixes for each market segment.

This 7 steps approach to market segmentation is very simple and practical and works for most marketers. However, if you are curious about other methods and want to experiment, you should take a look at computer-aided techniques, such as clustering and positioning.