An independent review of the BBC's new digital radio services is published on Tuesday. BBC News Online looks at each station's aims and their target audience.
1XTRA
Went on air: August 2002
Target audience: 15 to 24-year-olds
What the BBC says:
1Xtra focuses on the full range of contemporary black music with an emphasis on new UK artists, tracks and genres. It is aimed at... fans of contemporary black music and in particular young British black African/Caribbean listeners.
It provides music output 24 hours a day, punctuated by bespoke BBC news bulletins and other speech output designed specifically to be pertinent to the audience. 
Programmes/presenters: Diggz, G Money & Nesha, Robbo Ranx
ASIAN NETWORK
Went on air: October 2002
Target audience: Young British Asians under 35.
What the BBC says:
The network is designed to offer a wide range of content for British Asians, providing news, sports news, music and a forum for debate. It is the only national Asian station available on DAB Digital Radio and stands out from Asian local stations in the UK, particularly for its news and current affairs coverage. 
Programmes/presenters: Silver Street, Breakfast with Gagan Grewal, Drive with Ray Khan
6 MUSIC
Went on air: March 2002
Target audience: 25 to 44-year-olds
What the BBC says:
It aims to be different from other popular music stations available today. It has no interest in whether a record was a chart hit but cares passionately about the quality and diversity of popular song. 
Programmes/presenters: Andrew Collins, Craig Charles, Liz Kershaw, Phill Jupitus
BBC 7
Went on air: December 2002
Target audience: Children and adults seeking accessible speech, drama and classic comedy
What the BBC says:
BBC 7 was created to grow a new generation of speech radio listeners by offering a different kind of spoken word network to any on offer elsewhere. 
Programmes/presenters: The Little Toe Radio Show, This Sceptred Isle, The Goon Show, Dad's Army
FIVE LIVE SPORTS EXTRA
Went on air: February 2002
Target audience: 25 to 44-year-olds, similar to Five Live, but aiming for more ethnically diverse and slightly younger listeners.
What the BBC says:
Sports Extra's schedule is driven totally by the sporting calendar and by what commentaries are provided by BBC Radio Five Live.
During some busy weeks, Sports Extra can be on air every day, sometimes providing commentary on several different sports in the same 24-hour period. 
Programmes/presenters: Test Match Special, live Formula One racing