BPT are classified as follows:
SME: SME's is a Business Analyst or the manual tester who has good knowledge of the application. They design the manual Business Components which will test a specific action or functionality. While designing the manual Business Components, they will clearly mention the test steps and the expected results.
QTP Expert: QTP Experts convert the manual Business Component into automated Component by automating the steps mentioned in the manual Component.
Once the Components are designed, an SME, or QTP Expert will arrange those Components to form BPT, which forms a test scenario.
Tester: Tester can be manual tester or QTP expert who can execute the BPT's from quality center.