This paper evaluates the impact of Lexia Reading software on the progress of children experiencing reading difficulties in four Northern Ireland Schools. The program is designed to raise reading standards through a phonics-based approach to learning to read. A key feature of the software is the use of an "assessment without testing" tool, to accurately place children on the program and to adapt the program to meet the individual needs of each child. (Contains 6 figures, 4 tables, and 1 footnote.)