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https://www.theinformedslp.com/review...

1. Interactive — Does the parent's language match the child's focus?
2. Linguistic — What object labels does the parent use?
3. Conceptual — Is the meaning of the words clear?

Mattie, L. J. & Hadley, P. A. (2021). Characterizing the richness of maternal input for word learning in neurogenic disorders. Seminars in Speech and Language. https://doi.org/10.1055/s-0041-1730914
 
Rowe, M. L., & Snow, C. E. (2019). Analyzing input quality along three dimensions: interactive, linguistic, and conceptual. Journal of Child Language. https://doi.org/10.1017/s030500091900...