OOD (Introduction to OOAD)

Design emphasizes a conceptual solution that fulfill the requirement rather than its implementation.
for example: a description of database schema and software object.
Ultimately design can be implemented, Design encompasses the discipline approach. we use to invert a solution for some problem, so design providing path from requirement to implementation.
In Contrast, in the OOD phase typical Question starts with "How...?"
"how will this class handle its responsibility?","How to ensure that class knows all the information it needs?","How will classes in the design communicate?". The OOD phases deals with finding conceptual solution to the problem -It is about fulfilling the requirements, but not about implementing solutions.