"improve usefulness" is correct and usable in written English.
You can use it whenever you want to describe attempts to make something more useful or successful. For example, "The company has recently implemented measures to improve usefulness in their customer service."
The advantages of the redesign included: improved usefulness; improved efficiency and productivity; reduced learning time; improved usability; and increased acceptance among users.
We propose an integrated approach to work process and decision modeling, characterized by both an improved usefulness of the models and less effort for their creation.
As an active moderator both improves usefulness scores and causes more suggestions to be made, it seems reasonable to speculate that an active moderator improves the usefulness of design feedback in particular by guiding the participants to provide more constructive feedback, that is, more suggestions.
Due to its improved usefulness in distinguishing residual active lymphoma and benign fibrosis, FDG-PET/CT has been found valuable in assessment of treatment response (Fig. 8).
Greater knowledge of ocular US will allow radiologists to improve the usefulness of this technique in the clinical setting.
So, improving radiotherapists' attitudes towards discussing emotional problems and using screening instruments may not only improve the usefulness of a screening instrument like the SIPP, but also patients' satisfaction with care.
We hypothesized that, as in some other domains, a better integration of use and users in informatics systems could improve the usefulness of the cooperative tool.
Offering guidance on how to provide useful feedback and when to withhold feedback may improve the usefulness of reviewers' reports to authors.
