Here's the next instalment in a 'slow conversation' with Seb Schmoller, which kicked off with my post Progressive austerity and self-organised learning, followed by a response from Seb. I think it's fair to say Seb is more cautious than me so far. He splashes a little cold water on my enthusiasm for things "lightweight" — pointing out that the institutional and technical infrastructure underpinning informal learning is far from lightweight — and worries that I underestimate the importance of accreditation. He's probably right. I'll come back to those points in a roundabout way in a bit.