Logical vs Physical models

What's the difference between logical and physical models?

Logical models:

• Document business requirements to show what a system does
• Are implementation independent
• illustrate the essence of the system

Physical models:

• Show not only what a system does but how a system is physically and technically implemented.
• Are technology depenent because they reflect the technology choices and the limitations of those choices.
  

Why are logical models better than physical models for systems analysis?

• They are technology implementation independent. This makes them more likely to be usable in the future when current tecchnology becomes outdated.
  
  
• They keep the focus on business requirements. They are less detailed so the readers don't get lost in technical details
  
  
• They are more viewer/user friendly. It would be easier to communicate system ideas to users with logical models because they wouldn't be overwhelmed with technical details.