directly to teams about their experience of using the TFD, the Insight Bristol team regularly monitored usage. This was consistent with the nature of the TFD being experimental at its inception, where developers were keen to understand what aspects of it were being used and what weren’t. “We have a TFD usage app that tracks usage. We can look to see what needs improving and what needs more development.” (Insight Bristol team) However, as part of setting up the project, baseline measurements were not developed around existing data sharing practice, which would have been key to demonstrating the value of the TFD. Social Finance Limited +44 (0) 20 7770 6836 87 Vauxhall Walk, London SE11 5HJ socialfinance.org.uk 61 This is something we noted as a particular constraint when trying to perform a cost-benefit analysis as part of this evaluation, see Section 5.5. Those we spoke to also described how usage of the TFD was used as a primary metric to demonstrate success. Yet, usage data alone may not give enough descriptive detail around how the product is being used or not. Without this insight, it may have been difficult to take informed decisions about elements of the product to improve or even decommission. We noted this issue particularly in respect of the targeted risk models. Practitioners said that for some time the CCE and CSE risk models were regarded informally as inaccurate and unclear, however without regular mechanisms to monitor issues and sentiment, this was not picked up which potentially prevented corrective action being taken. Some surveying of staff was done to understand benefits for frontline practitioners. However, surveys were conducted on an ad-hoc basis, reducing the ability to measure benefits over time. “We could have been better about where the best val