Understanding my wife's spending habit

Saying in India

you can find the depth of the ocean but not what girl is thinking about

http://moneycentral.msn.com/content/Savinganddebt/Learntobudget/P145741.asp

May the link above will help me to understand my wife's past spending habits...may be

Question : WIM questioned why i want to know about my wife's past spending habit..
My Grandfather used to say if you want to solve a problem always look in to the past it will provide so many lessons. Never bring up past actions only the lessons you learned...