There are four key players involved in a DIB: 1. Service provider: The development sector organisation or nonprofit that actually carries out the project and aims to achieve some set targets. 2. Investor/Risk investor: An investor or organisation that provides upfront capital to the service provider to carry out the project and achieve the targets. 3. Outcome funder: Usually a philanthropic organisation that pays back the original principal plus a return to the investor, if the targets are met. 4. Evaluator: An independent organisation that evaluates and validates the work of the service provider. Apart from these, a DIB could also have a project manager that oversees the entire process: helping the service provider manage their performance and resolving any disagreements or conflicts between parties, among other things.