I purchased Rockler's plan for a high chair and it's loaded with typo's and
mistakes.

1. says to taper back posts on all sides at 1.5 degrees and cut bottom at 7
degrees. Then it says to cut then ends of the arms that mate with the back
posts at 11 degrees. If the arms are parallel with the seat it should be
8.5 degrees. 7+1.5 = 8.5

2. says to taper the inside faces of legs 1.5 degrees, cut front apron at 4
degrees and dado for foot rests at 2 degrees. should be 2.5 degrees.

3. says to cut side aprons at 10 degrees, same 1.5 degree taper on leg and
to cut the stretcher at 9 degrees. should be 8.5

4. back post to be premortised before tapering 5/8" deep for crest rail.
Post is 15-1/4" long. After tapering 1.5 degrees you're left with a mortise
only
3/8" deep, However it also says to cut the crest rail to length and then
remove waste to form angled tenons 1/2" long.

Granted adjustments can be made.... it's just frustrating to have paid for
an idea of how a high chair is built instead of an accurate plan.