The tutorial introduces staircase design in SOLIDWORKS, focusing on creating a robust parametric model for the stringer. It covers UK building regulations for rise, going, and pitch, and explains automating calculations using equations and global variables. Key steps include determining step count, actual rise, and pattern spacing via Pythagoras’ theorem. The video demonstrates skeleton modelling with reference planes, linking dimensions to variables for stability, and building a master model that updates dynamically. It concludes with sketching and extruding the stringer, testing design extremes, and ensuring compliance with regulations before progressing to full staircase development.