X is not available.

Suppose Mr. A says, "X is not available." Is it universally "X is useless"?

• If so, then the perception that "X is not available" would be shared.
• Unless you have a very limited opportunity to try out X to see if you can use it. There are those who can use X and those who cannot, and Mr. A is the latter.

'Usable' is Attributes of relationships rather than single attributes.

• Relationship between tools and users, challenges and solutions

• Only "usable" when well matched.

• Useless.

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