The Public Service Association is disappointed with the Government's plan to merge the Ministry of Social Policy and the Department of Work and Income.
PSA national secretary Richard Wagstaff said the decision had been "rushed through without consultation or adequate thought."
Under the merger, Winz's 5000 employees will join the 200-strong Ministry of Social Policy to form the new Ministry of Social Development.
Mr Wagstaff said despite assurances from the Minister of State Services, Trevor Mallard, and the Minister of Social Services, Steve Maharey, public service workers were still anxious about possible job losses.
"The uncertainty and distraction that a restructuring causes is disabling for the work at hand and unwelcome for our members."
Mr Wagstaff said the PSA agreed with the Ministers about the problems caused by fragmentation of the public service and wanted to be involved in building a modern public service.
"However, we believe time and care must be taken to plan comprehensive solutions before more restructuring."
Mr Wagstaff said the PSA was concerned the new ministry would be "lopsided."
"It is to be responsible for advising government on 'strategic and cross-sectoral social policy', but does not include all the sector. A large proportion of the Minster of Social Policy's focus is on issues to do with Child, Youth and Family, yet CYFS is not part of this new organisation.
"We understand, and agree with, the reluctance to place CFYS under more uncertainty and disruption but it seems illogical to set up a body to look at issues across the sector but only covers part of that sector," said Mr Wagstaff.
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