Staff at the University of Stirling are striking, in a dispute over pay and pensions.
Members of the UCU trade union will also walk out tomorrow and Friday.
Talks are ongoing, in a bid to settle the dispute.
Thousands of staff at universities across the Forth Valley are taking industrial action.
UCU general secretary Jo Grady said: 'I'm pleased to say that whilst Acas talks take place on a confidential basis, we are making progress across a range of subjects and will bring you more information as those talks come to a natural conclusion.
'The employer chose to put out their pay offer and make it clear that it is final and that universities can implement the initial element of that pay offer. We need to be absolutely crystal clear; this is not a pay offer that has been agreed with us as a union, or any of the other unions involved in the negotiations."
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