"a progression in" is a grammatically correct phrase that can be used in written English.
Here is an example sentence using it: She showed a progression in her cooking skills by creating an increasingly complex series of dishes.
Progressive decline in function and/or a progression in symptoms and/or signs, based upon repeated formal testing, clinician examination, or other formal measurement (for example, informant questionnaire) for a minimum of 1 year.
Before the study we had assumed that at mid-term follow-up a progression in patellofemoral arthritis may lead to progressive impingement, anterior knee pain and adversely affect the outcome in patients who develop patella baja post-operatively.
There's a progression in management.
"They're seeing it as a progression in their capacities, and I think that's the important point".
Sketches of McCall's cover, in chronological order, showing a progression in perspective and detail.
Andres Rivera shows himself from three angles, and from left to right it's a progression in size.
When the initial shock wore off, he realized there was a progression in that fact.
I try to point out that it exhibits a progression in game stories, from basic fairy tales to something that explores parental relationships.
The #ToyLikeMe campaign I co-founded in April this year, to call on the global toy industry to start representing disability, marks a progression in disabled rights movements from calling for access to a call for cultural representation.
I have a recipe I use for pot roast, and hers is not it.' The play's central debate over the virtues of fact compared to fiction mirror a progression in Ephron's own career.
