I use different approaches for developing interactive information visualization systems which vary from sketching and storyboarding to coding interactive data sketches and custom visualization designs, enriched with many exploratory data analytics features for better understanding of the data. I most often use design study methodology, iterative design, and user-centered design in creating systems dedicated to domain experts.
In evaluating my visualization projects I have done different kinds of qualitative studies (semi-structured interviews and focus groups, contextual inquiry, etc.) in order to evaluate how people use and understand the data using visualization tools. I also have experience in grounded theory, affinity diagrams and open coding for analyzing qualitative data.
As my background is in infomation visualization and human computer interaction, I am familiar with the ethics, design, and analysis of various experiments involving human subjects.