Format
The format of the competition stayed the same as in 1974: 16 teams qualified, divided into four groups of four. Each group played a round-robin with two points for a win and one for a draw, and goal difference used to separate teams level on points. The top two teams in each group would advance to the second round, where they would be split into two groups of four. The winners of each group would play each other in the final, and the second place finishers in the third place match. For the 1978 World Cup, FIFA introduced the penalty shootout as a means of determining the winner in knockout stages should the match end on a draw after 120 minutes. The method, however, was not put in practice as both the third-place match and the final were decided before 120 minutes. The first World Cup to feature a penalty shootout was the 1982 World Cup, in the semifinal match between France and West Germany.
Read more about this topic: 1978 FIFA World Cup