How to replace the 'Description' text field by 3 separate text fields

Hi,

Would it be possible to replace the existing 'Description' text field of an entry by three separate text fields, like 'Observations', 'Analysis' and 'Resolution'?
Can this be achieved within the existing configuration options?
Or do I need to modify some code?

I would appreciate some suggestions on how to make this work.
I'm using version 1.1.5.

Thx!

Siebrand