What are the accusation system and investigation system in the procedural law?

Around the 13 ~ 14 century, when the litigation system in civil law countries changed from the early accusation type to the inquisitive type, the litigation system in Britain gradually developed from the initial accusation type to the confrontational type. Although the difference between defense and accusation is not as prominent as that between defense and accusation, defense emphasizes the role of the parties and their lawyers in the litigation process more than accusation. In court, lawyers of both the prosecution and the defense play a major positive role; Judges and juries play passive and neutral roles. If the trial is compared to a sports competition, then the parties and lawyers are like athletes, and the judges and juries are like referees. Moreover, the functions of the jury and the judge also have a clear division of labor: the former is responsible for using evidence to determine the facts of the case, and the latter is responsible for presiding over the trial and applying the law. In this trial mode, all kinds of evidence, mainly witness testimony, become very important. In other words, the evolution from accusatory litigation to adversarial litigation has made evidence the center of trial, thus promoting the development of British evidence law.