The No Child Left Behind Act allows states to vary (a) the trajectories they select to move from the baseline percent proficient or above in 2002 to the 100% proficient goal in 2014, (b) the minimum number of students required for reporting of disaggregated subgroup results, and (c) whether or not they will use confidence intervals when determining whether or not an annual measurable objective has been met. We use data from Kentucky for the years 2003 and 2004 to explore the consequences of different design decisions. The effect of design decisions on number and percentage of schools meeting adequate yearly progress (AYP) is large, with important implications for education practice.