How many reasons must your thesis contain and which reason is first

The more sources the better
Every researcher aims to have a standardized and uniform study when a study will be replicated or repeated for various reasons.

The number of accounts and evidential support of your thesis must be consistent and be sufficient and succinct to the topic of study. These reasons and evidential support should claim proximate with the pronounced experimentation and variables which will be studied. In sense, the more accounts and sources the better is your study, the greater it will stand out and present itself. This is important for every thesis paper or dissertation since these accounts provides and explicitly discusses the studies that have been undertaken before which can greatly influence the current study's credibility and reliability.