The phrase "a plan was formulated" is correct and usable in written English.
You can use it when describing the process of creating or developing a plan, often in a formal or academic context.
Example: "After several meetings, a plan was formulated to address the issues raised by the community."
Alternatives: "a plan was developed" or "a plan was created."
A plan was formulated to merge the French and Dutch fleets and attack Ireland together in the summer of 1797.
On 10 April, a plan was formulated to withdraw Greek and Commonwealth troops from their positions in the Verria pass of the Vermion Mountains to the River Aliakmon.
By 1997, the federal government had already cut tariffs to 22.5 percent, from 57.5 percent ten years earlier; by 2000, a plan was formulated to reduce the tariffs to 15 percent.
Beginning in February, with the help of the French ambassador Léon Roches, a plan was formulated to stop the imperial court's advance at Odawara, the last strategic entry point to Edo, but Yoshinobu decided against the plan.
In the sixth and last step, a plan was formulated for an RCT with a waiting list control group to evaluate the training course.
The following operational definition of a PMR plan was formulated for evaluation of relevant studies: a PMR plan or program includes one or more meals replaced by a commercially available, calorie-reduced product(s) that are fortified with vitamins and minerals and at least one daily meal consisting of regular foods.
A new plan was formulated.
In adopting the guidelines of Universal Education Program that had been developed by the colonial administration 6 years before independence, a detailed plan was formulated and tabled in the legislative assembly in 1952 and approved unanimously.
A stepwise plan was formulated: the initial plan included induction of general anesthesia through the placement of a left DLT using the King Vision™ VL.
A statistical plan was formulated to accommodate the relatively small sample size, (we used 12 dogs in total, compared to 9 similar studies testing cognitive bias in dogs, rats, starlings and sheep that used from 6 to 32 animals (mean number of subjects: 19.9) [ 18, 24- 31], and consideration that a Bonferonni correction would be too conservative and likely to result in Type II errors [ 32].
The educational intervention included feedback of audit data and attendance at a workshop during which a practice development plan was formulated by participants.
