Two stakeholders from the Building a Better Budget Process (B3P) Project, convened by Convergence and facilitated by CBI, recently testified before the Joint Selection Committee on Budgets and Appropriations Process Reform. Their address took place on May 9, 2018, and you can watch it here. The panel of four witnesses includes Emily Holubowich and Matt Owens, both of whom were participants in the B3P process.
More about the B3P process and how a group of 23 coalition participants came together to agree on principles, themes, and five specific reforms can be found in a recent article from the Hewlett Foundatation, "U.S. budget reform: the nudge Congress needs."
The final report from this process, which outlines the recommendations and guiding principles in detail, was released in February 2018.