I'm not sure if you made a typo or not but in the current context I can only see negligible being relevant.
Advantages: Primary sources directly address your topic and often provide information that is unavailable elsewhere. For example, the questions you compose for an interview or a survey will likely target your unique interest in the topic. Similarly, to test a particular hypothesis, you can design your own experiment.
Disadvantages: Some primary sources, such as eyewitness accounts, may be too close to the subject, lacking a critical distance. Others, such as interviews, surveys, and experiments, are time consuming to prepare, administer, and analyze. Finally, unless you have been trained in accepted methodologies, your own primary research in certain fields of study may not be recognized as valid.
Roman government established the idea of sharing power between a main leader (in the Roman’s case the Emperor) and another branch (in the Roman’s case the senate). This established the foundation for checks and balances. It also took into account the people’s opinions, which would somehow reflect the American principle of we the people.
