Every number here is a working estimate to check with your building authority. Whoever prints this page takes responsibility for what is in it.
Stairs, landings and handrails
Rise, run, stringers and rails. 9 lessons.
Rise and run limits. Change it. Change the risers and treads until this stair passes. 
The bottom riser trap. Change it. Mark out this stringer so every riser comes out the same. 
When a stair needs a landing. Change it. Fold this tall stair into flights, and make the landing safe. 
How wide a stair must be. Guess first. Guess first, then try other widths on this stair. 
Handrail or guard cap. Change it. Choose a top rail a hand can hold. 
Stringer depth and spacing. Guess first. Guess first, then try each stringer size. 
Where the stringer meets ground. Click the fault. Click the two weak ends of this stringer, then fix them. 
Tapered treads and spirals. Change it. Widen the narrow end of these tapered treads until they pass. 
Lighting the stair. Spot it. Light this stair so every step shows after dark.