Phases of prototyping
Last night, I was thinking about how I would explain the phases of prototyping as I experience them and I did a very quick sketch (below). The diagram is not very pretty but well enough to make my point. I guess this should be one of the principles of prototyping: pretty enough to communicate the point.

Obviously, it is no surprise that the number of ideas decrease and the resolution of the prototypes increase as one goes through these steps.
Here are some more thoughts on the steps:
Illustrating the idea
These are mostly low-res sketches that explain the core concept. They are products of brainstorms, individual sessions, or random trains of thought. When I sketch, I focus on the core of the idea and do not think too much about details and secondary uses. Such sketches help me ask whether the idea is relevant to what I am trying to accomplish and worth the investment. And of course, whether it brings something new and exciting to the table. Depending on the complexity of the idea, these sketches are useful for getting immediate feedback from people.
Demonstrating user value
This is where I put ideas in context and demonstrate value for potential users. At this phase, I usually think of linear sequences at first, like a story/narrative and how the idea fits in, how it meets a specific need. I try not to think about the specifics of the technology unless there is a big issue with the infrastructure. Prototypes at this stage do a better job than basic illustrations especially when the complexity is high or anticipated use situations are unconventional.
Simulating functionality
Simulations vary from canned interactive prototypes to working systems that are close to the actual. These types of prototypes are best for usability tests (and self satisfaction) and can reveal a great deal of information that enlighten the path to implementation. I try not to spend too much time on close-to-actual prototypes unless I am convinced about the value of the idea since this is pretty detailed work and consumes a lot of time.
So. Illustrate-demonstrate-simulate. Nice rhyme.










