Staff augmentation allows you to bring in qualified developers to your team and still maintain complete project management, priorities, and daily operations. Outsourcing is a process that includes delegating a complete project or a complete service to an external provider who will oversee the team, implementation, and delivery. Staff augmentation would be more appropriate if you require a rapid expansion of in-house capacity and wish to have direct control. In case you need a partner who will take care of end-to-end project delivery, outsourcing is more appropriate.