Going To or Will?
In daily life is there a real distinction between the following structures:
"I am going to + verb" and "I will + verb..." ? Or they can be used in interchangeable way?

Question

Going To or Will?
In daily life is there a real distinction between  the following  structures:
 "I am going to + verb" and "I will + verb..." ? Or they can be used in interchangeable way?

Answer

'I am going to' suggests an intention or a plan.
I will suggests a confirmation that it 'will' happen, therefore more probable

Answer

There is a real distinction, but they can often be used interchangeably. I had this come up a few hours ago:

http://classic.italki.com/discussion/115802

Answer

Ho intenzione di comprare una borsa a Milano. - I am going to buy a bag in Milan.  (o forse non  a  Milano) 
Comprerò una borsa a Milano. -  I  will  buy a bag in Milan  (solo  a Milano ,  perché ci vado per questo motivo)