The phrase "a serious development" is correct and usable in written English.
It can be used to describe an important or significant change or event that has occurred, often with implications or consequences.
Example: "The recent findings in climate research represent a serious development that could impact policy decisions worldwide."
Alternatives: "a significant change" or "an important occurrence."
Planning for the report "started over a year ago, when we thought that there was a serious development problem in the Arab countries," Rima Khalaf Hunaidi, director of the United Nations Development Program's Arab regional bureau and the driving force behind the survey, said in an interview in her New York office.
It has done everything except engage in a serious development program in Mindanao, one ambassdor said.
I realised this was a serious development: surprisingly, though, the case continued until the end of the afternoon.
"Clearly, this is a serious development that will now be factored into the club's ongoing investigation," Eels director Geoff Gerard said.
"A serious development of CCS is in our opinion essential for the medium term viability of any significant shale gas industry," says the report.
She said a Greater Manchester police call about a "serious development" in the case on Tuesday left her terrified that Ling was somehow on the loose.
"This is a very serious development," Frank J. Gaffney Jr., a former Pentagon official who directs the Center for Security Policy, a private group in Washington, said of the Korean launching on the MSNBC talk show "Hardball".
He called the North Korean threat to disregard the armistice "a very serious development".
The prime minister, Tony Abbott, cancelled a visit to Indonesia this week, and the Indonesian foreign minister, Marty Natalegawa, said it was a "very serious development".
Indonesia's foreign minister, Marty Natalegawa, said on Tuesday that it was a "very serious development" if confirmed and he was critical of the Coalition's policy.
Creagh said it was a "very serious development" and demanded action to ensure that "illegal and carcinogenic horse meat stops entering the human food chain".
