The phrase "a far more rigorous" is correct and usable in written English.
It can be used when comparing the level of rigor or strictness of one thing to another, emphasizing a significant difference.
Example: "The new policy is a far more rigorous approach to ensuring compliance than the previous one."
Alternatives: "a significantly stricter" or "a considerably more demanding".
"Shiite clerics get a far more rigorous education than Sunni clerics.
Watching the court in action is a far more rigorous test.
Dr. Schimmack points to daily Gallup surveys, at well-beingindex.com, as a far more rigorous approach.
Yet conservative scholars at the Manhattan and Fordham institutes laud it as promising "a far more rigorous, content-rich, cohesive K-12 education".
In a statement, a Colgate-Palmolive spokesman, Thomas DiPiazza, said the product had a far more rigorous safety review than other toothpastes.
But when on Oct. 21 plainclothes investigators came to the door of his home in Lahore, it was the beginning of a far more rigorous interrogation.
"We have introduced the EBacc so more pupils are encouraged to study the core academic subjects that universities and employers demand and we will be introducing a new, far more rigorous examination system".
Building an understanding of market potential is a good start, but companies can get far more rigorous by deploying a benchmarking approach that we have named the growth MRI (after the high-resolution medical-scanning technology).
Judging on the forecast for three years, two years and one year and then the individual budget items and then the budget as a whole, the process is far more rigorous than we have in this country.
David Grissmer, also a researcher at Rand, released a 250-page report that was far more rigorous and comprehensive than Mr. Klein's.
In my experience at uni continuous assessment, as GCSE's currently are, is far more rigorous than a two year course that you can pass or fail on the basis of one exam.
