The phrase "a special usefulness" is correct and usable in written English.
It can be used when describing something that has a unique or particular benefit or advantage in a specific context.
Example: "The new software offers a special usefulness for data analysis that previous versions lacked."
Alternatives: "a unique benefit" or "a distinct advantage."
In these kind of conflicts, those who display the fiercest loyalty to their own group and fiercest hatred of the "other" have a special usefulness – providing not only the most ruthless killers because they are challenged the least by the morality of what they are doing, but often also acting as examples of what the new culture of conflict "requires" of all members of the group.
In Roppongi such a verb has a special usefulness because of Japan's drinking customs.
Summarising the above, the existence of some correlations in results of biomechanical and clinical examinations in patients after the meniscus tear surgery with a subsequent rehabilitation imply a special usefulness of the peak torque measurements at 60 s−1 angular velocity and the one-leg-rising test for evaluation of a knee function.
It is economical and of special usefulness to makers of strange worlds, plunging a reader into a new reality and leaving them space to feel like a participant in its creation.
Knowing what type of plane the enemy is sending over has its special usefulness; for one thing, the type of fighter plane best fitted to combat it can be sent up.
The workflow showed special usefulness for collating data from various sources, including various protein targets as well as datasets generated under various conditions.
In this chapter, we survey various automated modeling techniques, with a special focus on GUI models and their usefulness in analyzing and testing of the modeled GUI applications.
Sir Richard enthuses about Affymax, a Californian firm that he bought two years ago, and which has developed a special technique for screening chemical compounds for their usefulness.
The replacements were subsequently given cursory training between missions, but U.S. military historians contend that the inexperienced replacements dramatically decreased the usefulness of the company as a special forces unit.
In fact, The San Francisco Bay Guardian, one of the city's weeklies, explicitly advertised its usefulness for just that purpose, printing a special clip-out page in last week's issue.
But because of its history, its scale and its usefulness to so many political interests, Indian Railways presents a special challenge to reformers.
