While not new, since the concept was already described by Christopher Alexander in its architectural theories, it only gathered some traction in programming due to the publication of Design Patterns: Elements of Reusable Object-Oriented Software book in October 1994 by Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides, known as the Gang of Four (GoF), that identifies and describes 23 classic software design patterns.
Use a calculator to calculate the stair riser length or the number of steps you'll need. Divide the height from the first floor to the top of the second floor by a predetermined height of your choice for the riser. The typical height of a riser is 6 or 7 inches (15 to 17.5 cm).
Asker's rating. 1  DHHS states that the average number of stairs in a flight is 12. 2  This Site Might Help You. 3  every two story house I have lived in a flight of stairs have been 13 - 14 steps. 4  15 to 17. 5  in a house with 8 foot ceilings there would be 13 or 14 steps. 6  it depends on the distance to be covered.