The phrase "a level of difficulty" is correct and usable in written English.
It can be used when discussing the challenge or complexity of a task, problem, or activity.
Example: "The exam had a level of difficulty that surprised many students, making it harder than they had anticipated."
Alternatives: "a degree of difficulty" or "a measure of difficulty".
What he's after is an elusive blend of anxiety and exhilaration — a level of difficulty that requires physical and analytical prowess, as well as self-discipline and imagination.
As DaimlerChrysler has tried to produce workable and cost-efficient ways of doing business as a single entity, it has run into a level of difficulty that was not anticipated when the deal was struck.
It is standard practice to include questions that have not been tested on a national sample of students, he said, but those questions are usually kept to a minimum and the scorers assign them a level of difficulty based on questions that have been tested on a national sample.
Scoring twice within seven minutes of halftime, Dempsey tripled the one-goal lead Lamar Neagle gave Seattle just before intermission, his spinning pass at the top of the penalty area ahead of his first goal adding a level of difficulty to a game that's become too easy this spring.
To confirm the item fit to the assumed levels of difficulties, each item was assigned to a level of difficulty.
That had a level of difficulty, too.
Precision, a lovely surface, a reasonable level of difficulty, and an audible chuckle when illumination dawns.
Lastly, fellowship pursuance was chosen as an outcome, assuming a higher level of difficulty in obtaining a fellowship for residents from programs without fellowship programs.
There are cases in which "it is more meritorious to realize a lower value at a given level of difficulty … than to realize a higher one" (Findlay, 1961, p. 381).
That brings the problem of exploiting the trade-off between computation and communication in a VSN into a different level of difficulty.
In this paper, we are working on the problem that: to obfuscate an Android application to a target level of "difficulty" degree, while not substantially "slowing it down".
