To investigate all alleged violations of international human rights law since March 2011 in the Syrian Arab Republic
To establish the facts and circumstances that may amount to such violations and of the crimes perpetrated
And, where possible, to identify those responsible with a view to ensuring that perpetrators of violations, including those that may constitute crimes against humanity, are held accountable.

From HRC resolution S/19-1 (Al-Houlah)

To urgently conduct a comprehensive, independent and unfettered special inquiry, consistent with international standards, into the events in El-Houleh
If possible, to publicly identify those who appear responsible for these atrocities
To preserve the evidence of crimes for possible future criminal prosecutions or a future justice process, with a view to hold to account those responsible
To provide a full report of the findings of its special inquiry to the Human Rights Council at its twentieth session
To coordinate, as appropriate, with relevant United Nations mechanisms.

From HRC resolution 21/26

To conduct an international, transparent, independent and prompt investigation into abuses and violations of international law, with a view to hold to account those responsible for violations and abuses, including those that may amount to crimes against humanity and war crimes.