The organization should set objectives and measures its effectiveness against the objectives. While it might not give you a sense of the organization's relative

The organization should set objectives and measures its effectiveness against the objectives. While it might not give you a sense of the organization's relative effectiveness (i.e., the objectives might be nigh impossible and making any progress at all is a miracle), at least you have a general overall sense of what they're trying to accomplish and how effective they are at solving those problems. A data-driven and specific approach to projects will give people a chance to ask questions like: is this problem worth solving? Is the UN the right organization to solve this problem? Is this problem worth the cost we're putting into the UN? Is the UN taking the right strategy? Etc. If my government is funding the UN, I'd want a statement of what the UN is attempting to do with that funding, and which parts of that my government supports and thinks is valuable. I'd also want my government to conduct its own assessment of whether the UN is effective (GAO style) and include that analysis in its recommendation to me of whether to continue to fund them with my tax money.