The phrase "in a joint project" is correct and usable in written English.
You can use it when referring to a project which two or more parties are working on together. For example: "John and Sue were working together in a joint project to find a cure for the disease."
In particular, it united hundreds of thousands of British Muslims with their neighbours in a joint project of peace.
Xian'er was developed as a robot in a joint project between the temple, artificial intelligence experts at Chinese universities and a technology company.
It was the second step in a joint project that American experts hope will provide jobs for up to 4,000 Russian weapons scientists and workers.
I invite them today to work together with us in a joint project to make Britain once again a force for good in the world.
In his spare time, he got involved in a joint project with a well-known Belgrade sexologist aimed at rejuvenating the sperm of infertile men.
Britain can become a serious participant in a joint project that mobilises private resources to address its energy conundrum as part of a broader European Green New Deal.
Founded in 1993 as a joint project with the National Center for State Courts, the courtroom is a harbinger of technology that could one day show up in courts across the nation.
Busy Bee opened in 2004, a joint project of Mr. Malewich, who has lived most of his life in the neighborhood or just north in Murray Hill, and his friend Emey Hoffman, a well-known figure in the downtown bike world.
In the first three months, 248 charges of abuse reached the special commissioner of investigation for the New York City School District, an increase of 35 percent over the same period last year, according to a report in SchoolBook, a joint project between The New York Times and WNYC.
It is housed in Congresspedia, a joint project of the Center for Media and Democracy and the Sunlight Foundation.
Nor had I any knowledge of the proposed Agua Zarca Dam in Honduras, a joint project of Honduran company Desarrollos Energéticos SA (DESA) and Chinese state-owned Sinohydro, the world's largest dam developer.
