i'd like to know that also. if the pattern is sisters choice, with all those pieces, and it's a 10" finished block and you want to make it 8" or 12" how can you change all those pieces? i wouldn't even know what size strips to cut, never mind adding 7/8". wouldn't the pieces be some weird measurement, iike 13/14ths or something?. especially if you started with pieces calling for 7/8" and you wanted to enlarge 1/3 or 1/4. or in the above case, going from 10" to 12" you're enlarging 1/5th. (right?)