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The scope is a (depth|level) of a hierarchical namespace.

As namespace, the scope groups name but at a hierarchical level.

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Example

• the global scope of a linux file system is /
• the local scope for a file is the directory where it's located.

Uniqueness

In a specific scope, only one primary element with the same primary key can exist.

Example:

• In a file system, in a specific directory, you can't have two file with the same name.
• In a table, you can't have two rows with the same primary key.

Quality

As with each group functionality, the less you have in your scope, the beter.

You should follow the magical number (seven +-2)

The code quality / maintainability will increase, your test will be more isolated