It's a mix of several things. We've built up the infrastructure in the typical Icelandic way of probably spending way too much money on it. Most towns/villages have an indoor fullsize pitch or at least a smaller astro-turf pitch that's heated to be able to use it throughout the whole year. Then we've spent a lot of time and money investing in getting coaches at all levels well educated. So kids have proper facilities and proper training from a young age. But then I think the real secret is that we have a mix of the Icelandic mentality (which is to be strong, independent and just react to what is in front of you rather than plan anything) with the Swedish rigidness and planning. So you have a bunch of guys who all work really hard, who many of them are quite talented footballers and a bit "mad" but they are put inside a framework and given specific instructions that somehow works wonders with the Icelandic chaotic behaviour. We play a rather rigid 4-4-2 with two hard working, big strong forwards and then the two wingers are both playing as inverted wingers meaning they always get up and support the forwards rather than play wide stretching the play. And then we have Gylfi Þór in midfield and I'm of the opinion that if he was from a more "exotic" footballing nation he'd be playing for the best teams in Europe rather than just being the main man at Swansea. tl;dr - Mix Icelandic hard working chaos with Swedish rigidness and planning + good infrastructure.