As far as valuing ideas up front, we plotted them at discrete points in the creative process. There was one particular "critical" meeting we used early on as a

As far as valuing ideas up front, we plotted them at discrete points in the creative process. There was one particular "critical" meeting we used early on as a landmark, because a lot of our product ideas came out that day. We would ask ourselves "what % of our value was idea X before that meeting?" Then we would extrapolate it to a year out, to see if the slope of decay looked right to us. With some linear interpolation, we came up with a number along its decay line that represented its value today. Revaluing things retrospectively isn't something that we've talked about yet but it's certainly a space for further exploration. I think our hope is that there will be enough time delay between someone proposing an idea and its valuation that we'll have some actual customer data or feedback that we can evaluate. As to the long-term viability of our system, only time will tell :-)