This system was the best-known to seventeenth-century colonists. The common law system included a set of rules that were used to solve problems in society. It was based on the history of decisions previous judges had made instead of lawmaking codes or laws. This system made a distinction between two basic types of crimes: felonies and misdemeanors. The legal process, mostly for more serious crimes, involved a grand jury, composed of members of the community, which decided whether there was enough evidence for prosecution. However, in these proceedings no district attorneys or public prosecutors were available. The victim of the crime was responsible for instigating the prosecution and financing it. It was these fundamental principles that stuck with the colonists and were used selectively to create a new and unique criminal justice system.