The phrase "a useful document" is correct and usable in written English.
You can use it when referring to a document that provides helpful information or serves a practical purpose.
Example: "The report was a useful document for understanding the project's progress and future steps."
Alternatives: "an informative document" or "a helpful resource."
The CoreSight Technology System Design Guide is a useful document for getting an overview of the architecture.
The video of New York police officers putting a man named Eric Garner in a choke hold, after which he died, is a useful document.
This is a useful document for students who file early in the semester and need some verification of their degree in advance of its conferral (note: degrees are only conferred twice each year).
Ann Powers, of Los Angeles Times said that while the film offers only a few such "insights into Jackson's artistic process, though enough surface to make this a useful document, as well as a beautiful one" that the film is "a piece with Jackson's body of work: dazzling and strange, blurring the line between fantasy and reality".
For instance, recall may be of only little consequence once the user has found a useful document.
Having a comprehensive coverage over this issue, the research is a useful document to identify difficulties, legal actions and reasons for the system to get improved and move to a higher stage.
With more than four million definitions submitted so far, and 2,000 more coming in every day, Urban Dictionary is a stunningly useful document that unlike most media is made and used by actual young people — in droves.
Initially prepared for purposes of tax assessment, it is a potentially useful document for studying how the relationship between public and private spheres is inscribed in urban space.
A particularly useful document in this series is Opler's curriculum vitae from 1979, which provides the fullest available bibliography of his writings.
The report "is a solid global summary, and it remains an enormously useful document," says epidemiologist Chris Beyrer of the Johns Hopkins Bloomberg School of Public Health in Baltimore, Maryland.
Creation of a clinical guideline is an immense task, and we commend the writing group for their efforts in creating a comprehensive and useful document summarising the available scientific data informing management of STEMI patients.
