Question related to prioritization process

1. Most organizations have limits to the resources they can apply to their portfolio(s) of projects?all projects must be considered and not every project will be started. What kinds of weighting factors do organizations consider as part of their prioritization process? Please use the text and other readings and cite properly, plus share your own experiences.

2. In real life, some projects are started without a clear understanding of how to measure their success. Explain the effects this has during the project life cycle and at the project's completion.