Created by Kent Beck and Ward Cunningham in 1996 the XP methodology
        defines the highly disciplined, core software engineering practices
        essential to every Agile project. Version 2 of XP was released in 2004.
        A few terms differ between the two
        most popular Agile methods, XP and Scrum.
      
      
        
          | XP | Scrum | 
        
          | Iteration | Sprint | 
        
          | Product back log | Master story list | 
        
          | On-site customer | Product owner |