For every human function there is a possible spectrum of abilities ranging from excellent to non-existent. (ccdonline.ca)
Actually, what hard questions show is that the paper is challenging the full ability range, while errors show that humans were involved in the process and none of us is perfect. (schoolsweek.co.uk)
They enjoy practical investigations suitable for the whole ability range and we even find staff talking about the topics and working together so there is a school - wide buzz of excitement. (qaeducation.co.uk)