control - DALI : How commissioning process takes place in DALI system?

I have gone through various documents regarding the Commissioning in the DALI interface. But I finding it difficult to understand some of the points. So if anyone with DALI Commissioning can help me understand the commissioning procedure. I already know this part.

1. 
   

   first initialization command is sent.

   
   


2. 
   
   

   Then randomize command is sent which will generate 24-bit random address at ballast side.

   
   

After this how it assigns the short address to each ballast is out of my knowledge and this is where I am stuck right now. Any help would be much appreciated.