Meeting Wikipedia's notability requirements is one of the greatest obstacles that individuals encounter when they create a Wikipedia page. All articles must match the site's requirements for notability to be added to the encyclopedia. For novel or complex problems this can be difficult. Regarding plagiarism and violation of intellectual property, Wikipedia is highly rigorous. Only verifiable sources must be used, and they must be properly cited by editors. Wikipedia has strong editorial guidelines that must be complied with. The writing of articles must be objective, and they must be properly prepared and referenced.