Nominations are open until the first week of December for the new leader of the Scottish Socialist Party.
Any member of the party is eligible to stand, however, five of its six MSPs are in poll position.
The election will take place at the party's national conference in February, but until then the party will be led by "collective rule".
ROSIE KANE: GLASGOW
Rosie Kane entered politics with the anti-M77 motorway campaign.
Since then, she has prominently opposed the M74 extension plans and campaigned about toxic waste in south east Glasgow.
She also objects to water fluoridation and GM crops and was arrested during an anti-nuclear demonstration at the Faslane submarine base.
A single mother of two, she lives in Govanhill and is the socialists' environment spokesperson.
CAROLYN LECKIE: CENTRAL SCOTLAND
Carolyn Leckie is from East Kilbride and is a union leader who represents thousands of hospital workers.
Ms Leckie, a trained midwife, has campaigned against low pay and hospital cuts and has also spoken in parliament about poll tax arrears.
She became the first MSP to be expelled from the parliament's debating chamber.
Ms Leckie was shown the door in May this year for "disorderly behaviour", after a row with the presiding officer.
FRANCES CURRAN: WEST SCOTLAND
Frances Curran has been involved in socialist and community campaigns for more than 20 years.
As part of the Save Our Services campaign she was involved in community occupations to stop the closure of a school and community centre.
She is a founding member of the SSP and has stood for election three times in the last five years.
Ms Curran joined other MSPs in backing calls for a ban on adult pornography in Scotland.
ROSEMARY BYRNE: WEST SCOTLAND
Rosemary Byrne is a trained teacher and the party's education spokeswoman.
She has been critical of plans by Education Minister Peter Peacock for a shake-up of schools.
Ms Byrne claimed that Mr Peacock was "in denial" over a shortage of primary school teachers.
As secretary of Irvine and North Ayrshire Trades Union Council, she was at the forefront of major local campaigns.
COLIN FOX: LOTHIANS
Colin Fox is the Scottish Socialist Party's justice spokesman.
He is one of the organisers of the Edinburgh Mayday Festival and founded
the Edinburgh People's Festival.
He was also frontman for the alternative Holyrood parliament opening ceremony at Calton Hill last month.
Mr Fox, who lives in Edinburgh, was formerly a Labour Party Young Socialist before becoming a founder member of the SSP.