Analysis:
Whenever Real Madrid loses a match the Spanish press in particular the Madrid daily sportspaper Marca cries out: sack the coach!
It seems to be the universal and very short term solution to a problem regarding the performance of the 11 players on the field.
So let’s look at the numbers for the past 20 years to see if the change of coach has brought significant results.

The columns read: season | coach | nationality | titles (if any otherwise blank)
1990/91 Alfredo Di Stefano Argentinian (naturalized Spaniard): 1 Spanish Super Cup
1991/92 Antic Yugoslavian:
1992/93 Leo Beenhakker Dutch:
1992/93 Benito Floro Spaniard: 1 Spanish Cup | 1 Spanish Super Cup
1994/95 Vicente Del Bosque Spaniard: (just serving for a couple of months until new coach was appointed).
1994/95 Jorge Valdano Argentinian: 1 League
1995/96 Jorge Valdano
1996/97 Arsenio Iglesias Spaniard:
1996/97 Fabio Capello Italian: 1 League
1997/98 Heynckes German: 1 Spanish Super Cup | 1 Champions League
1998/99 Hiddink Dutch: 1 Intercontinental Cup
1999/00 Toshack Welch:
1999/00 Vicente Del Bosque Spaniard: 1 Champions League
2000/01 Vicente Del Bosque 1 League
2001/02 Vicente Del Bosque 1 Champions League | 1 Spanish Super Cup
2002/03 Vicente Del Bosque 1 League | 1 Intercontinental Cup | 1 European Super Cup
2003/04 Carlos Queiroz Portuguese: 1 Spanish Super Cup
2004/05 José A. Camacho Spaniard:
2004/05 Mariano G. Remón Spaniard:
2004/05 Vanderlei Luxemburgo Brazilian:
2005/06 Juan Ramón López Caro Spaniard:
2006/07 Fabio Capello Italian: 1 League
2007/08 Bernd Schuster German: 1 League
2008/09 Bernd Schuster German:
2008/09 Juande Ramos Spaniard:
2009/10 Manuel Pellegrini Chilean:

The numbers are taken from the website Real Madrid coaches
So over the past 20 years Real Madrid has had 21 coaches if each period of Capello and Del Bosque who both served 2 terms are counted individually. This means that on average the Real Madrid coach has served less than 1 season at a time. Over the same time span Real Madrid has won 18 titles taken all together.
Primary:
6 league titles | 3 Champions League titles. Total of 9 primary titles.
Secondary:
1 Spanish Cup | 5 Spanish Super Cups | 2 InterContinental Cups | 1 European SuperCup. Total of 9 secondary titles.

The by far most successful coach was Vicente Del Bosque with 7 titles during his second reign at the club which lasted for a whole 4 seasons by far the longest time any Real Madrid coach has served throughout the past 20 years.
13 international coaches (counting Capello twice). Winning 9 titles. 8 out of the 13 coaches serving (again counting Capello twice) managed to win at least one trophy in any competition.
8 Spanish coaches (counting Del Bosque twice). Winning 9 titles. Only Del Bosque and Benito Flores have won anything among the Spanish coaches.
It seems to be impossible to find any pattern as to the relationship between wins and the coach (or the firing or hiring of coaches) except for the period of 4 seasons where Vicente Del Bosque served and where Real Madrid won no less than 7 trophies including! 2 League titles and 2 Champions Leagues titles by far the most coveted trophies.
So if the recent history of Real Madrid coaches shows anything at all – because of course there are many other factors in play such as quality of players – opponents – luck – format of tournament etc. in order to determine success – it is that some kind of continuity on the bench is key.
While one has to give credit to Fabio Capello as well for having won 2 out of 2 League titles as coach of Real Madrid.
Curiously enough Del Bosque and Capello will both be present at the World Cup 2010 in South Africa as national team coaches leading the way for Spain and England respectively towards the glory and immortality.

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