Which mathematical software product was completely redesigned based on customer feedback in the 1990s, shifting from command-line to a notebook interface that revolutionized how equations are displayed and manipulated?

The landscape of mathematical software has dramatically evolved over the decades, transforming how professionals and students approach complex calculations, visualization, and problem-solving. Behind these powerful tools are fascinating stories of innovation, customer feedback cycles, and product iterations that shaped modern mathematics education and research. Test your knowledge of how consumer feedback influenced some of the most important mathematical software tools in history!

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Mathematica (which introduced its revolutionary notebook interface in version 2.0 after extensive user experience research)
MATLAB (which maintained its matrix-based command-line approach throughout the 1990s)
SPSS (which focused on statistical processing rather than mathematical notation and visualization)
Maple (which added a graphical interface but didn't adopt the notebook paradigm until the 2000s)