Thanks Tom,
Right question. Right Time.
Let’s scope two approaches. One philosophic. One scientific.
The philosophic We’re watching the emergence of a new form of democracy. If this new institution is based around the trust of a Nation’s citizens, then the Swiss form of democracy - more direct than representative - offers most idealists a light at the end of the tunnel. Representatives, many believe, are now locked into an institutional bubble where, even if they can withstand the limitations placed on them by a party edict, they’re still unlikely to withstand the lobbying of well-heeled interest groups. That’s the philosophic context. (my opinion of course)
The scientific approach is more about Open Learning, of which Open Government is the impact/funding part. To illustrate, I’ll just point at one department at the EU bubble where they believe policy-making is the be-all of government. Its the same in most “democratic” countries where the children/bureaucrats are educated to believe that policy proceeds (changes in) practice, rather than (more realistically) policy as formalisation of changes that have already occurred outside their silo.
You have no idea how frustrating it is, to listen to bureaucrats who have no idea of (IP) networking capabilities/limitations, thinking they can make policy that will control Artificial Intelligence, particularly when, at the office, most live inside a Microsoft (operating system) colony. They are the problem; not the the solution.
Successful Open Government ? For me its when bureaucrats/ functionarios focus both perspectives - philosophic and scientific - on sharing their tools/communications with citizens. To be fair, that’s quite a paradigm shift when your job has always been about just issuing a report. Ignoring the Wikipedia approach takes quite a discipline.
From a practical scientific/technological perspective, Open Government means being able to Log In to a public app/online network/service without the possibility of being monitored by a government agency. We are all monitored by private companies (Google and Co) these days. That’s OK. They just want to sell me something.
Its quite reassuring, watching the English-speaking world shy away from the idea of a National ID. Obviously a digital ID is necessary. Otherwise (if nothing else) Ruchir will think I’m an AI agent. 
But open (democratic) government doesn’t really kick in until one can prove they are a citizen, or a resident, or a … (depending on the requirements of what a citizen is doing) without revealing who they are. Voting is the end democratic process of this argument. Journalism is the interim stage, where we are all potential journalists - a mindset that requires a change in social culture.
We’re getting close now. Its taken over 10 years to get this far in the UK. Cultural change spans generations. Ive watched two changes so far.