The phrase "a previous stage of" is correct and usable in written English.
It can be used to refer to an earlier phase or level in a process, development, or timeline.
Example: "The research findings were based on a previous stage of the experiment, which provided essential data for the current analysis."
Alternatives: "an earlier phase of" or "a prior level of".
First, in a previous stage of the research – the model was defined.
These configurations are investigated as plausible solutions to the problem of improving the strength, ductility, and energy absorption capabilities of panels tested in a previous stage of the experimental program.
A new tailor made ionic liquid (IL), tetraoctyl ammonium 2-methy-1-naphtoate [TOA MNaph] was designed in a previous stage of our research on MEG recovery from aqueous streams (Garcia-Chavez et al., 2011) [3].
First, with the help of sophisticated instruments, such as telescopes and electron microscopes, we are able to observe more and more entities, which had to be considered unobservable at a previous stage of scientific and technical evolution.
In a previous stage of his life he was a lawyer.
As an indication of how important the action this week could be, Europol said a previous stage of the campaign in 2016 allowed law enforcement agencies to identify radicalized individuals in more than 100 countries around the world.
A previous staging of the state-sponsored piece earlier this year saw more than 40 artists on stage, combining live music with video art and circus-like antics.
A previous stage to the computation of intensity statistics is a region segmentation of every B-scan according to the intensity variation along the vertical direction.
One is the technology that has given political actors the capability to reach more people more of the time in more places than at any previous stage of human history.
A previous stage project of her's involved her singing maternalish bittersweet nothings to her snaggle-toothed, gremlin-like Chihuahua Shivers.
However, in the flowchart, these phases are connected in two-way relationships because interactive software is usually produced iteratively; it is frequently necessary to refine the results of a previous stage before moving on to the next one.
