53.8% is an extraordinarily high failure rate for an external assessment. And 2013 was about the same. The root cause in my opinion is lack of capability and few professional development opportunities made available to build the capability. I personally found the assessment straight forward and my students have done quite well. BUT that is because I have a professional background in this area, many teachers do not.
Either the Ministry or Industry needs to step up and help with professional development in this area of Digital Technologies, in a similar fashion to what they are trying to do for programming and computer science aspects of DT.