Have fun with that. At the end of the day you run into the same problem as most wikis, where people just "threw stuff over the wall" into a big wiki database, and it gets to be really difficult to find relevant decisions. Eventually people add a new decision that contradicts an older decision that they didn't find, then later on someone with better search skills finds both contradicting decisions. It doesn't help anyone. All you did was increase the cost of making a decision by forcing a higher documentation cost, which slows down the business.
Most companies looking at structured decision making are better off with a better approach to writing internal policy, which is a kind of technical documentation. You need someone to own the meta/framework surrounding policy (clean presentation, different ways for different questions to reach the same policy, handling the workings of how different owners have permissions to control their areas of policy, making sure stakeholders are notified of changes, etc.), and a culture of collaboration which encourages people to propose changes to outdated policy (and not just dismissing them out of hand). Good policy simplifies decision-making: either it's already allowed by policy and people are free to continue without bureaucracy, or a proposal to change policy results in a tangible artifact already in the relevant place, either the accepted proposal or an addendum to the policy explaining why alternatives were rejected.
This may be true in some cases, but I’ve also seen issues with too many stamps, signatures, red-tape, tribunals/committees, and multi-stage approval chains.
There’s a balance somewhere put there, but that balance is different for everyone.
Personally I think problematic decision making is more to do with the “blame” side of ownership. It benefits the unsure more than the certain, and not many people are okay with making and admitting to mistakes.
