Workers at Japanese electronics firm Fujitsu in the UK will stage the first of a series of one-day strikes later in a row over pay, jobs and pensions.
Members of the Unite union are protesting about the firm's plans to cut 1,200 jobs, freeze pay and close a final salary pension plan.
The union urged the firm to return to the negotiating table with "a sensible offer acceptable to our members".
Fujitsu employs a total of about 12,500 people in the UK.
Unite first warned of strikes in August and its members voted to take action last month.
"It seems that the company are hiding behind the recession to attack the pay and conditions of their workforce," said Unite national officer Peter Skyte.
"Our members would prefer not to strike, but feel strongly that Fujitsu is not listening to their genuine concerns and that enough is enough."
The company has 26 information technology services offices in England, Wales and Scotland.
Those in England are in Basingstoke, Birmingham, Blackpool, Bolton, Bracknell, Bristol, Crewe, Exeter, London, Lytham St Annes, Manchester, Newcastle upon Tyne, Slough, Solihull, Staines, Stevenage, Wakefield, Warrington, Warwick and Winnersh.
In Wales there are offices in Cardiff and Swansea and in Scotland in Dundee, Glasgow, Edinburgh and Inverness.
In Northern Ireland, the company also has premises in Belfast and Londonderry.
Source: BBC News