1978 FIFA World Cup Netherlands and Brazil were the gold, silver and bronze medalists, respectively. Iran and Tunisia made their first appearances in the tournament. This was also the last World Cup tournament to use the original inclusion of 16 teams. Since the first World Cup in 1930, only 15 teams (plus the host, who automatically qualified) had been allowed to qualify (the reigning title holders also received automatic qualification from 1934 through 2002); but for the next World Cup, in Spain, FIFA expanded that tournament to 24 teams. The official match ball was the Adidas Tango. Argentina was chosen as the host nation
National team appearances in the FIFA World Cup group stage. The first host ever to fail to advance past the first round was South Africa in 2010. † denotes the best result in the team's history, ‡ - the best result at the time of the competition (improved later). The defending World Cup champions were formerly granted an automatic spot in the Cup finals field. As of the 2006 tournament, this berth is no longer guaranteed. However, no defending World Cup champion has yet failed to qualify. Automatic berths have never been given for defending World Cup runners-up. Defending runners-up are 15-for-18 in qualification efforts for the following