most product developers fail because they segment their customers by their demographic characteristics (age, gender, education, income, etc) rather then their needs. The assumption these marketers make is that similar demographic segment would have similar needs. Introduction of customer "personas" allow marketers to assign a proposed product' functions and features to specific customer groups within the demographic segments. Subsequently, all these assumptions are validated by surveying consumers, who belong to the chosen segments and correspond to "persona" as defined by product developers.
I see three fundamental flaws in the described methodology:
1. Multiple layers of assumptions being constructed, before the validation of an entire construct is done;
2. The validation methods are highly subjective and often produce low integrity results;
3. The method uses inside-out view of potential customers.
These flows lead to introduction of products that are very difficult for consumers to differentiate, and as the result lead to lower profit margins.
The advent of The Social Customer provides product developers with an alternative segmentation method - the approach that at once zeroes in on a market segment composed of customers (not consumers) who have purchased existing products that the planned product intends to challenge.