This is a data sheet I like to use with my articulation kiddos. There is space for 5 different days of therapy, or 5 different sounds. I do the speech activity (e.g. /r/ word medial) and strike through the numbers in the column that applies. If the child requires no assistance (no prompts) I strike through the numbers under independent and if they produce one that is incorrect I strike through incorrect numbers. There are columns for independent, minimal, moderate assistance and incorrect. After the session I'll add up the numbers real quick and write the percentages right next to the column.