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The company that assesses benefit claimants in NI, Capita, has apologised to Derry and Strabane councillors for any errors made by them in the past.
Capita and Department for Communities (DfC) officials were speaking at a special council meeting on Wednesday.
Councillors highlighted the problems some people faced when trying to access Personal Independence Payments (PIP).
Brendan Flynn of Capita said: "There's always a risk that we won't get things 100% right all of the time."
He told the meeting: "On the occasions where things do go wrong - we apologise - and we will continue to apologise and seek to put things right as soon as we become aware of any issue where we might have failed.
"We look to put in place safeguards, checks and balances and the continuous improvement processes to ensure those errors don't happen again."
In June, Communities Minister Deidre Hargey confirmed the DfC's contract with Capita had been extended for a further two years until 2023
PIP assessment: Capita apologises to council for errors - BBC News