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Search the industry for similar projects and use them as benchmarks
First of all, it's very difficult to accurately measure the evaluation of a project without a baseline or end-line. However, there might be an alternative work around - not as good, but it could work.
Depends on the project itself.
For instance, if it's related to a service given to beneficiaries (for well-being and psychological support for example) you can use a counterfactual indicators.
Basically, you select a new group of people who DIDN'T receive the service, or didn't benefit from the program, and another group of regular beneficiaries, the you just do a comparison between those two groups. This will show the effect of your project by measuring how good it did when compared to "what would could've happened if it wasn't implemented".
If you refer to a public service project, which could be impossible to find a regular group of beneficiaries, you can use either previous records from the government or another organization. Or you can use surveys or questionnaires to measure the satisfaction of the beneficiaries.
According to me, if there is no baseline data. Consider a project that is at it's best and compare the others to it until you receive an industry standard. Continuous development is required for prospering.