Generate a full detail guide on Business Process Outsourcing (BPO) for small to medium-sized businesses. The guide must be a strategic framework. It should include detailed sections on: 1. How to identify which non-core functions are good candidates for outsourcing (e.g., payroll, IT support, customer service). 2. A checklist for vetting and selecting a BPO vendor. 3. A guide to creating a Service Level Agreement (SLA) to manage the relationship. 4. Strategies for effective communication and management of your outsourced team. Please include a disclaimer about the risks of outsourcing.