By picking up this book, you are committing to becoming a T-based person. A T-person is based on two factors, the horizontal and the vertical, as shown here:
The horizontal factor represents the breadth of knowledge. This is the knowledge that can be obtained through life experience, curiosity about people, and cultural education, and is the knowledge that can produce insight. Insight can then travel down the vertical stem of the T, which represents the depth of knowledge, and becomes connected to speciality knowledge. Depth of knowledge is a concept that applies to any specific domain, for example, a General Practioner (GP) represents the horizontal bar, whereas a cardiologist (the specialist medical skill of understanding the heart) would represent the stem of the T. Being skilled at your profession requires considering what your breadth and depth of knowledge concern.
For HCI, this means having and understanding an extensive knowledge...