“Over many years I have witnessed the frustration and heartache of many families for whom a reason for their child’s developmental delay has not been found by looking at their chromosomes down a microscope. More recently I have been delighted to see the relief and joy of other families on receiving a diagnosis for their child lucky enough to have had their DNA tested using array analysis. I welcome the DDD project with its cutting edge array and DNA sequencing technologies since it offers to so many more families, now and in the future, greater hope for a genetic diagnosis and the prospect of information, help and support tailored to their child’s genetic disorder.”