Syrian opposition activists, including National Coalition members, have drawn up a roadmap to achieve national reconciliation and justice for "all of Syria's victims".
The roadmap is to be presented in full on Wednesday, in the presence of National Coalition chief Ahmed Jarba, but has not been officially endorsed by the key opposition group.
"National reconciliation will be achieved through a long transitional justice process in which justice is assured for all of Syria's victims," said the statement on Tuesday, outlining the roadmap.
It comes amid reports of abuses carried out by both regime forces and rebel fighters in Syria's conflict.
While the country's uprising began with peaceful anti-government demonstrations in March 2011, it has turned in a bloody war that has left more than 100,000 people dead.
The proposals also call for disarming and restructuring Syrian security forces to uproot "corrupt officials".
"All armed groups will be disarmed, demobilised and reintegrated into Syrian society."
The roadmap also lays out plans for the country's political system after the fall of the Syrian regime, calling for a "hybrid presidential/parliamentary system".
It proposes using the country's 1950 constitution as the basis for a new charter, with an elected constitutional assembly mandated to decide on modifications.
Syria's constitution privileges the legislature over the executive, and states that the head of state must be a Muslim.
The group behind the proposal, Syrian Expert House, includes 300 activists, lawyers and members of the opposition National Coalition and Syrian National Council.
Defected government officials and rebel commanders also participated in the drafting process, the group said.
