I’ve realised I’ve used the term “sweet spot” without explaining myself. What I mean by the term is the point where strong business strategy, compelling market insight and technology capability come together. IMHO, only if all three come together can you hope to have a product, business model and marketing concept which really delivers. If the technology underpinning the product, the business model and/or the marketing message is sufficently differentiated, you can deliver a true market breakthrough product. The bit which especially fascinates me is the technology bit, but if you believe Clayton Christensen, you can do a lot (maybe more) with business model and market positioning as well. I use the model to ask the right questions to ensure that technologies I develop are really bang on target. I think it helps a lot.