I made a relational model using vb. I've created the code based on Claude seidmann book. well it's process well. but when i want to browse the tree result in analysis Manager there's an error message : " Unable to browse the mining model PMB_RDBMS object or provider is not capable of performing requested operation" I really don't understand with this error message. And the next question is how can i see the result after processing it? and the last question is How the algorithm works when splitting the tree i mean what method it used. i need the answer. THANKS A LOT.ASAS