What are the things you should do when forming narrow, homogenous submarkets?

Multiple select question.

Aim to create no more than two submarkets, assuming that customers who do not clearly fit into these submarkets should not be targeted.

Begin by creating a submarket centered around a "typical" customer, then begin adding similar people to this segment.

Write down important need dimensions and customer$-$related characteristics to help determine which customer types should be included in submarkets.

Create new submarket$($s$)$ for people who do not fit into the initially created segment.