Personnel and process determine policy. How parties choose who serves in leadership roles, as committee chairs, and as members of particular committees matters a lot. To a large extent, the rules of the party conference or caucus control who can serve in leadership, as a committee chair, or on a committee — and lots of other things, too.
These investments would not be politically possible, however, but for the advocacy of outside organizations for a transparent Congress, which creates a virtuous cycle. Transparency groups push for greater data accessibility through the use of digital technology and hold organizing events. Congress responds by bringing together internal stakeholders and allocating funds to modernize technology to meet that need. The modernization effort saves money, improves internal efficiency, and results in the release of more data. The release of data results in new tools being built and prompts transparency groups and businesses to push for further technology reforms.