What is the process followed in market segmentation?

What is the process followed in market segmentation?

a.Identify current and future demand of the market. Eg. a corporate firm maybe requiring canteen facilities which catering organisations may research and identify.

b.Examine the characterisics of the segments: which maybe on the basis of product features,lifestyle or behaviour.

c.Evaluate the above segments as per the measurability,accessibility and size.The future actions of the company would depend upon the results or findings of this process.