A small collection of recently published or updated reports from three legislative research organizations are listed below.
From the UK Parliament-House of Commons Library
ISIS/Daesh: the military response in Iraq and Syria
58 pages; PDF
Syria: a reading list
10 pages; PDF
Iraq and Syria – developments in 2015
54 pages; PDF
From the European Parliament Research Service
Dismantling Syria’s chemical weapons programme: an early look at the prospects and obstacles
From the Congressional Research Service (via Federation of American Scientists)
Armed Conflict in Syria: Overview and U.S.Response
31 pages; PDF
For additional reports about Syria and other Mideast Countries prepared by CRS, see this web page from the Federation of American Scientists