Either ... or...

[nyggus]

Hi, is the following sentence correct?

"They either do not optimize the conditions of the process or do not use methods that are optimum in the sense above-mentioned."

Best,
Nyggus

[Coffa]

It is rather a clumsy construction, but the only grammatical error is that "above-mentioned" is an adjective. It is either "the above-mentioned sense" or "the sense mentioned above".