The phrase "a trial stage" is correct and usable in written English.
It can be used to refer to a preliminary phase in a process where something is tested or evaluated before full implementation.
Example: "The new software will be released in a trial stage to gather user feedback before the official launch."
Alternatives: "a testing phase" or "an experimental stage."
The third is Dr. Sabelli's test, which he warns is still in a trial stage.
A trial in the Southeast case against the D.F.A. is scheduled to begin in January; the Northeast case against the cooperative has not reached a trial stage.
"Women who are victims of domestic violence could be appearing before a generalist judge to determine their family court matter at a trial stage.
Even as lenders have in recent months accelerated the pace at which they are reducing mortgage payments for borrowers, a vast majority of loans modified through the program remain in a trial stage lasting up to five months, and only a tiny fraction have been made permanent.
The Los Angeles Department of Transportation introduced an alternative parking meter system called "ExpressPark" as a trial stage in 2011 in a small area of downtown Los Angeles.
Both sides are set to argue Monday before an appellate panel as to whether the companies may continue to operate in New York as the case proceeds to a trial stage.
Still, she wins over the stuffy family and the community, but not until after she is stalked by a brutal former husband who is after her wealth, a trial stages her innocence, and her attempted suicide proclaims her honor.
How identification of costs falling outside the public sector that are relevant to programme implementation can be captured at a full trial stage also needs to be considered carefully.
As many of you will know, a malaria vaccine is in an advanced trial stage, and may be licensed by 2013 or 2014.
It was De Marchi's first Grand Tour stage win since victory on stage 14 of the 2015 Vuelta, although he helped win a team time trial stage at last year's race.
Parading across a makeshift stage decorated with flags and speaking in exaggerated Jack Webb jus'-the-facts-ma'am deadpan, they at times looked and sounded like the scripted participants in a show trial staged by a totalitarian state.
