usefulness
n. uncountablen. the quality of being helpful or having a practical purpose. You use this to describe how much something helps you get a job done.
n. the quality or state of being advantageous or serving a practical purpose. Often used to evaluate the value of a tool, idea, or method in a specific context.
The usefulness of this new app is very high.
The committee questioned the usefulness of the old data, arguing that more recent statistics were needed for the report.
While the prototype demonstrated significant technical innovation, its practical usefulness in a domestic setting remained limited by its high energy consumption and complex interface.
From useful + -ness.
Typically uncountable; when used with 'of', it describes the specific object or concept being evaluated.