Input (grade 13): In many minor rugby nations, such as the case of rugby union in Poland, development, has tended to concentrate on rugby sevens as a means of introducing the sport to people.
Output (grade 12): Rugby sevens is the shortened version of rugby union in which only seven players per side feature, instead of the full fifteen. The version of rugby union is very popular, with notable competitions including the IRB Sevens World Series and the Rugby World Cup Sevens.