The phrase "a challenging plan" is correct and usable in written English.
You can use it when describing a plan that is difficult to execute or requires significant effort and skill.
Example: "The team developed a challenging plan to improve the company's sustainability practices over the next five years."
Alternatives: "a difficult strategy" or "a demanding proposal."
"That's given us a stability and ability to plan a challenging program," Mr. Karp said.
If I forget to start the first day of the plan, I'd receive a message suggesting perhaps I should try a different, less challenging plan.
From Clermont's, it centred on whether, having established physical authority, they could use it to implement a wider, more challenging plan of action.
You also need to actively manage your research project by developing a realistic but challenging plan, ensuring that the relationship with your supervisor and other stakeholders is effective, and monitoring your progress against clearly defined goals.
While the Affordable Care Act is comprehensive and will hopefully bring about positive changes for the country's health care system, it remains a contentious and challenging plan to fully understand.
The police action was the latest violent crackdown by the government against a growing protest movement challenging plans to replace a park in Taksim Square, Istanbul's equivalent of Cairo's Tahrir Square, with a replica Ottoman-era army barracks that would house a shopping mall.
As master of America's No. 1 cable TV operator, Roberts will have a new set of challenging plans to execute: Comcast also said it will offer phone service to more than 40 million households in 2006.
Residents of an Oxfordshire village are challenging plans to send troubled city families for relationship-building breaks in a 19th-century mansion – claiming that "urban families" aren't suitable for the area.
Land abandonment is one of the most challenging planning problems facing shrinking cities in the United States.
The DNS configuration is one of the most challenging planning issues, and it must be set up correctly to make internal resources accessible to external hosts and external resources accessible to internal hosts.
