The phrase "are developing well" is correct and usable in written English.
You can use it to describe the positive progress or improvement of a project, situation, or individual over time.
Example: "The new software features are developing well, and we expect to launch the update next month."
Alternatives: "are progressing nicely" or "are advancing positively."
"Overall, our relations in this area are developing well, and we would like to continue strengthening them – in aviation, shipbuilding and other sectors".
Chief executive Michael Geoghegan said: "Although we remain alert to the impact of strains being seen in Europe, the emerging market trends are developing well and it is good to be able to report a pre-tax profit in the US in the first quarter – the first quarterly profit since 2007.
Riders like Ben Swift, Ian Stannard, Pete Kennaugh and Geraint Thomas are developing well, and having them in our professional team allows us to work with them towards 2012, which might not be so straightforward if they were in other teams.
"Our bookings for the full year are developing well, especially in the UK and Airlines Germany," Peter Fankhauser, its chief executive, said "The tough trading conditions we reported previously in some markets are showing early signs of improvement, and our new product and winter sun initiatives are leading to growth".
"They are playing well and proving, certainly since I have seen them last year, their games are developing well.
In the automotive sector, flywheels are developing well as a braking energy recovery technology under the influence of two motors of innovation.
The ABO antigens are developed well before birth and remain throughout life.
Guyana's ecotourism industry is developing well.
But even Movie Maker is developing well, though.
Franco Farina, the Manrico, seems to be developing well.
During early rehearsals his Macbeth seemed to be developing well, but at some point he lost it, and on the opening night he was not good.
