How could observational drawing be a useful technique in the define & inquire phase of the design process?
Observation drawing is a useful way for designers to find inspiration or take a concept from the real world into a design. Designers are able to have a better understanding of perspective and the way objects look which can be very useful when trying to recreate an object in software.
What is visualization drawing and what are the biggest challenges?
Visualization is the process of mentally constructing, shaping, and understanding a piece of information or idea in order to externally communicate the idea. Drawing is one of several ways in which this process occurs. The biggest challenge in this process for me is the lack of drawing practice, and therefore it becomes difficult to link visualization to the drawing.