The phrase "a useful focus" is correct and usable in written English.
You can use it when discussing a specific topic or perspective that helps to clarify or enhance understanding in a particular context.
Example: "In our research, we found that adopting a useful focus on user experience significantly improved our product design."
Alternatives: "a beneficial emphasis" or "a helpful perspective".
We chose to use several checklists as these checklists are commonly used and were a useful focus for our discussion on quality.
Since coding categories were occasionally changed in response to what was observed within the response transcripts, reliance on inter-rater reliability analyses and coder retraining (an often used exploratory research method) was not considered a useful focus in this study.
And it will remain a useful focus for the public debate through which history unfolds.
But when it sticks to achievable, measurable targets, such as increasing the area of nature reserves in the ocean, it can provide a useful focus.
The degree to which issues other than the percentage increase or cut should come into play is a useful focus for a discussion of good outcomes.
In the United States, it would provide a useful focus for state and local public health officials to do something game-changing, rather than sitting on the sidelines waiting for Washington to act.
Throughout this paper it will be stressed that while these positions can serve as an useful focus for investigation, a full understanding of overlap requires an appreciation of all of these evolutionary processes and their corresponding evolutionary sequence.
Both the simulation and experiment results indicate that MSO is a useful focusing element.
That said, it may be a useful, focused addition to the scene.
To provide a useful, focused microarray system for RNA diagnostics, we developed a novel platform termed Genopal™, which is comprise a hollow fibre array (Fig. 1).
The predictions made by the web server, therefore, do not replace experimental verification but rather provide a significant and useful focus for such experiments.
