How to use another word or other words to replace "extent" in a given sentence?

Question

This is the given sentence: Usability: “The extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use.”

I'm trying to use another word to replace extent in the above sentence.

In the google dictionary, extent means the area covered by something.

So, usability is an "area" which a product can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use.

Does it make any sense in English?

After doing more google search, there are two more ways to paraphrase the sentence.

1. Usability refers to methods for accessing or improving the way to achieve specified goals by specified users with effectiveness, efficiency and satisfaction in a specified context of use during the design process.

2. In software engineering, usability is the degree to which a software can be used by specified consumers to achieve quantified objectives with effectiveness, efficiency, and satisfaction in a quantified context of use.

How could I write a better sentence?

Thank you for reading this question.

Answer 1

You could replace your definition with a noun clause introduced by where, or how far a product...

Usability:“where a product can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use.”

The problem is that 'where' 'how far' creates a partial ambiguity, 'a garden path.' because the reader will be expecting a direct question. The ambiguity might be removed by adding a verb:

Usability:“explains where a product can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use.”