"difficulty execution" is correct and usable in written English.
You can use this phrase when referring to the difficulty of executing something, such as a task, plan, strategy, or concept. For example, "The strategy seemed sound on paper, but the difficulty in execution made it a failure in practice."
Judges mark trampolinists on difficulty, execution and flight time during short routines which contain a series of moves such as somersaults and twists.
It's sort of like a figure skating competition where you create an original routine and you are judged on level of difficulty, execution, artistic merit, and you can enter at multiple levels so that you are competing with others in a similar point in their training.
(The gymnasts are graded separately for difficulty and execution; for the execution score, the differences were much tighter, with Raisman only a tenth of a point above the two other medalists).
Runs are judged on difficulty and execution of tricks done over both jumps.
No one then or now even approaches her level of difficulty or execution.
States have had difficulty securing execution drugs in the wake of a boycott by their European-based manufacturers.
Since then, the scoring system has altered so that marks are now given for both difficulty and execution, which includes presentation and artistry.
The skating union suggested a system in which skaters would receive marks for each maneuver based on degree of difficulty and execution.
Mr. Levine said that newer developers can run into "more difficulty of execution" than older professionals, and have to be reminded that "all markets that go up can go down".
During a three-year run that has seen her win the all-around at each of the 12 major international competitions she has entered, no one has even approached her level of difficulty or execution.
The two top teams from Monday night's pairs free skate were both beautiful to watch, according to Ron Ludington, a United States coach of many Olympic pairs, but the Canadian team outshone the Russians in the technical difficulty and execution of the moves they tried.
