https://www.nngroup.com/articles/quant-vs-qual/
Quantitative vs. Qualitative Usability Testing - NN/G
Qualitative research informs the design process; quantitative research provides a basis for benchmarking programs and ROI calculations.
qualitative usability testing
https://www.nngroup.com/articles/qual-usability-testing-study-guide/
Qualitative Usability Testing: Study Guide - NN/G
Unsure where to start? Use this collection of links to our articles and videos to learn about planning, conducting, and analyzing qualitative user testing.
qualitative usability testing