On one hand, Third Party Monitoring (TPM) can be described in simple terms as the conducting of monitoring by a third party – i.e. neither the donor nor implementer. Alternatively, it can be seen as a complex, fast-growing field characterized by a wide variety of forms, all shaped by highly diverse donor needs, reflecting myriad local contexts. That said, it can still be distilled into two main types – the monitoring of the views of people, which is seen as more commonplace than the monitoring of assets. TPM is not only used by donors; it is used by some larger INGOs in high-risk areas where they themselves lack access.