Tight coupling results from not using pure interfaces for everything... All parameters and return values should be pure interface types .. that way, all dependencies can be passed in as Fakes or Stubs .. resist the temptation to call constructors in methods.
All parameter and return types are pure interfaces
Try to only call constructors inside of other constructors. Only call contractors in member methods if there is no other way ..
Tight coupling results from not using pure interfaces for everything... All parameters and return values should be pure interface types .. that way, all dependencies can be passed in as Fakes or Stubs .. resist the temptation to call constructors in methods.
That prevents coupling on an implementation level but not at a logical level. With TDD you can prevent both.