Discussion - industrial buying process

Explain Industrial Buying Process. What are the complexities involved in a Industrial Buying Behavior?

1. Need Identification. (The user Dept.)
2. Setting Purchase Specifications.
3. Set Purchasing Policies and Procedures.
4. Sourcing and Vendor rating. (Search for an appropriate vendor and evalu...)
5. Supplier Selection.
6. Purchase Order. (Raise a desire to purchase document)
7. Expediting. Constant follow up on orders placed.
8. Post Purchase evaluation.