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What is an assumption? Is it the same as design decision?

 
ZheMin Lin
Greenhorn
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As english is my second language, I'm confused with the concept of "assumption" and "design decision". Are they the same or different?
Any example will be more appreciated.
 
John Wen
Greenhorn
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Before marriage, you made the assumption that your future mother in law would not live with you & your girlfriend.
However, you were not sure. You asked your girlfriend. She said the assumption was not right and your mother in wanted to live with you two.
Now, you are facing some tough decisions. Are you going to live with your mother in law? Worse yet, are you going to marry your girlfriend?
 
Ajith Kallambella
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When requirements are vague, assumptions pave the way to quickly move forward instead of reading between the lines and getting confused.
Here is an examples -
Requirement :
During the flight booking, the system automatically retrieves award travel miles for the user.
Confusion :
What if the user is not the passenger? Can a person A book a ticket for person B?
Assumption :
The user is the passenger. A person can only book tickets for him/herself.
Assumptions do not always result in design decisions. They are just a set of facts and corollaries - a kind of "truth set" for your solution.
 
ZheMin Lin
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Many thanks to Wen and Kallambella
 
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