The phrase "a plan involved" is correct and usable in written English.
It can be used when discussing a situation or project that includes a specific plan as part of its execution or strategy.
Example: "In the project proposal, there was a plan involved to ensure that all team members were on the same page."
Alternatives: "a plan included" or "a plan entailed".
"I don't think there was a plan involved," he said with a lopsided grin, acknowledging that, even as a bartender, "I wasn't particularly good at that stuff".
While it is possible that such a plan involved assassinating Mr. Khashoggi, the official said, it is also possible that a plan to trick Mr. Khashoggi into returning to Saudi Arabia, or to temporarily incapacitate and kidnap him, went horribly awry and resulted in his death.
There is obviously a plan involved, even if I disagree with some aspects of the plan such as extensive involvement of the world bank and the IMF.
The exact timing for residential moves could not be determined so when a plan involved a residential move, she was considered to have achieved the goal if there was evidence that she moved by the second year of the study.
We suggested mediation, and a plan involving a little compromise and understanding on all sides.
In January, the Ottawa Senators announced a plan involving tax breaks, contingent on participation by the provincial and municipal governments.
"They have an approximation of a plan," involving leniency from the tax department and additional finance from banks.
A plan involving the use of 4,500 service drivers and 1,650 tipper lorries was considered capable of moving 100 kilotonnes a day of coal to the power stations.
Richard Holbrooke drafted a plan involving Turkey, Pakistan and Saudi Arabia sending arms instead of Iran, which would have greatly reduced Iran's presence in Bosnia.
Another sign that traders are confident that the ECB will announce a plan involving buying Spanish short-term debt this afternoon.
Reid released a plan involving bigger long-term spending cuts, with much of the heavy lifting done by a bipartisan select committee.
