That's not what the Israelis see. The boy is a hazy presence, ill-defined. Instead, I point to this story so that readers can better understand how humans perceive and interact with each other. Human emotions are complex and ideas are very deeply rooted. Put some thinking into this and you will be several steps ahead of programmers and developers and designers that fail to think about other people.
Psychology is known as a soft science, but it is tricky business.
Problems Facing the Usability Community article. I'll respond to everyone over the next few days. Also, feel free to comment on the article here . Paper prototypes provide a valuable and cost-effective means to evaluate and iterate design options before a team gets committed to one implementation. Interface elements such as menus, windows, dialogues and icons can be sketched on paper or created in advance using card, acetate, pens etc.