The phrase "a key actor" is correct and usable in written English.
It can be used to refer to an important or influential person or entity in a particular context, such as in business, politics, or social issues.
Example: "In the negotiations, the CEO was a key actor in shaping the final agreement."
Alternatives: "a major player" or "a significant contributor."
"Salah Abdeslam is a key actor in the attacks in Paris and St Denis (Stade de France).
Such information may revise the evaluation of an existing policy, increase the cost of an undesirable policy option, or change the public view of a key actor.
Throughout his international career, he was a key actor in the emergence of post-colonial West Africa and the social and economic development of the region.
Russia is a permanent member of the UN Security Council, an important diplomatic player in the Middle East and a key actor in Euro-Atlantic security affairs.
In a briefing note published on Saturday, the commission said "the UNHCR will be a key actor in the readmission [return] and resettlement processes".
Lloyd George, on the British side, a key actor in favor of war, called for the mobilization of a million men lest Britain not be 'taken seriously' in the councils of Europe".
"The private sector is not only seen as a key partner to mobilise additional funding but also, in certain contexts, as a key actor to support the response, facilitate communications and the transfer of funds, or logistics".
The three different observed manifestations of social capital include between key actors (micro), between a single key actor and a community (micro and macro), and the social capital within a group (macro).
In this context, a further key actor includes the people of Feldheim who can be considered too, because of their great contribution to the project.
We were not able to identify a single key actor initiating and driving the improvement process.
We suggest that the respondents' inability to identify a single key actor indicates that the interdisciplinary discourse facilitated can itself be understood as a key factor driving improvement.
