The phrase "a certain proficiency" is correct and usable in written English.
It can be used when referring to a specific level of skill or competence in a particular area or subject.
Example: "To apply for this position, candidates must demonstrate a certain proficiency in data analysis and reporting."
Alternatives: "a specific level of skill" or "a particular degree of competence."
"Once you reach a certain proficiency, you have a machine that can create almost anything," Mr. Abella said.
He also has a full-time instructor on staff who offers English-language classes to employees; they won't receive pay increases unless they have achieved a certain proficiency.
Because Pae's administrators and teachers are state employees, they are now required to have a certain proficiency in Estonian and to use it in more classes.
For a start, a certain proficiency in English is now a requirement for all secondary school children and university graduates.
The lack of significant frequency effects in *Greidanus and Nienhus (2001) for more advanced learners, *Horiba (2012) for Chinese learners, and *Greidanus et al. (2005) seemed to suggest that there may be a "threshold" word frequency for a frequency effect to occur or not occur among learners at a certain proficiency level.
A second frequent motivation for using proficiency estimates is the intention to include only participants above a certain proficiency criterion for example, because of the noisy or heterogeneous nature of language processes at lower levels of L2 aptitude.
Which sectors or divisions require employees with a certain English proficiency, and which sections do not have such a need for their staff?
There is a lot of stuff that hits a certain technical proficiency bar but leaves you feeling empty.
PISA follow-ups indicate that certain proficiency levels are associated with success later in life, while the CEFR provides a theory-based, widespread framework for localizing students on meaningful levels of language proficiency.
This tendency also became evident in the percentage of students from the different subgroups that reach certain proficiency levels on the PISA scale (see Fig. 5): While two-thirds of academic track students reached norm proficiency, only one-third of non-academic track students scored at or above baseline proficiency.
Although the concept of good leadership is subjective, there are certain proficiencies including effective communication, delegation, a positive attitude, competence, ethical decision-making, strategic planning, motivation, and interpersonal skills that are the cornerstone of being an effective leader.
