# Features

This chapter looks at Features, things which are common between more than one Variable, like for example belonging to a specific person.

The height of child A, person=child A

The weight of child A, person=child A

The height of child B, person=child B

The weight of child B, person=child B

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So in this case, there are four Variables but two are associated with child A and two are associated with child B. Theorymaker diagrams shown this Feature in a separate line within the Variable, with the name of the Feature in coloured type.

Sometimes it is useful to draw attention to features which are common between more than one Variable. They will be particularly useful later when we look at for Variables.

Features common to more than one Variable, spelt out in ordinary English, can be rewritten in the form of text following the name of the Variable,

This …

The height of child A

The weight of child A

The height of child B

The weight of child B

… can be rewritten like this:

The height of child A, person=child A

The weight of child A, person=child A

The height of child B, person=child B

The weight of child B, person=child B

(The commas are optional.)

Features are presented in a special way in Theorymaker diagrams.

You can even do this …

Measurement, type=height, person=child A, sex=male

Measurement, type=weight, person=child A, sex=male

Measurement, type=height, sex=male, person=child B

Measurement, type=weight, sex=male, person=child B

Different features are presented with uniform colours.