 Scope summary The cost-benefit analysis (CBA) aims to evaluate the historical costs associated with the TFD and its related products, compared to their monetisable benefits. Bristol City Council supports the costs linked to these projects, while the benefits extend to both Bristol City Council staff, and users within schools for TFE. The time frame for the CBA spans from its inception in 2015 to 2023. Costs encompass initial tool development, maintenance, and ongoing development expenses, including technical enhancements, adding new datasets, and IG review costs. Benefits only include time saved from using the TFD/TFE. Effectiveness benefits were omitted due to challenges in obtaining outcome data and the unreliability of attributing such benefits to the TFD / TFE. Consequently, this cost-benefit analysis accounts for only a portion of the overall benefits. Our calculations focus on cost of an hour of work as a proxy for financial value. However, in reality, the hours saved do not necessarily translate to fewer full-time equivalents (FTE) or direct bankable cost savings. There are a number of constraints on our analysis, which are detailed in the relevant sections and that we recommend be born in mind when considering our findings. Social Finance Limited +44 (0) 20 7770 6836 87 Vauxhall Walk, London SE11 5HJ socialfinance.org.uk 98 9.b. Historical costs Method and caveat: Scope: Costs encompass initial tool development, maintenance, and ongoing development expenses, including technical enhancements, adding new datasets, and IG review costs. The following method has been applied to ascertain the cost of each element:  We asked leaders within the Insight Bristol team to outline who was involved in the development of each element, how much of their time they were working