"explains the reasoning" is a correct and usable phrase in written English.
You can use it whenever you want to indicate that someone is providing an explanation for their decision or thought process. For example: "The professor explained the reasoning behind his choice of text for the course."
Cousins explains the reasoning behind what looked to the uninitiated observer a strange decision.
The City Council speaker, Christine C. Quinn, explains the reasoning behind her support for a bill to make kindergarten mandatory for city children.
As he explains the reasoning ("We'd rather be in the mountains than in the aisles"), the camera pans out to show that his desk sits not in an office but on a bluff, with mountains rising in the background.
Mr Zetsche explains the reasoning for the move: "There used to be an atmosphere of them and us," he says, referring to the Daimler-Benz people on the hill and the car business people of Mercedes at the factory.
Some influential figures believe the party should back a decisive in-or-out vote, perhaps even pre-emptively.Will Straw of IPPR, a centre-left think-tank, explains the reasoning.
Dr Azzam Alwash, the president of NI, who was instrumental in the programme of re-flooding the Mesopotamian Marshes after years of drainage under the Saddam regime and has stayed in Cley village during visits to England, explains the reasoning behind the donation: "Nature Iraq has received great support from international organisations for the conservation of our famous Mesopotamian Marshes.
You don't have to explain the reasoning.
Her special deputy for examinations, John Tinsley, explained the reasoning.
"I'll miss it, incredibly," says Abendanon before explaining the reasoning behind the move.
"I get it," he assures me as I rush to explain the reasoning.
Each guideline should be accompanied with a short paragraph explaining the reasoning behind it.
