Parents have met to discuss plans to re-arrange the way primary schools are run in Gwynedd as pupil numbers fall.
The council's plans were too vague the meeting was told
Possible changes include linking schools together under one head teacher or creating area schools.
Organisers claimed the county council is pushing through changes in some areas without proper consultation.
Education officials said they were consulting elected representatives, school governors and parents at every step to find the best way forward.
Thursday's public meeting was organised by parents, although the council is holding its own consultation events.
'Kept in dark'
"The council say their plans are sustainable, but I don't think they understand what that means," said Geraint George, chairman of the governors at Penisarwaun school.
"The definition of sustainable is that is encompasses financial, economic as well as community factors and these plans do not do that," he added.
Councillor Alwyn Gruffudd, who is a governor at Ysgol y Dorlan, Tremadog said not enough detail was available and everyone was "being kept in the dark".
Chairing the meeting Liz Saville Roberts said she was not against the idea of change, but it was wrong to force everyone to do the same thing regardless of whether they wanted to or not.
"Some people who want to move forward with a federal system should be allowed to do so with every support from the council," she said.
Parents from the Dwyfor area came to the meeting in Penygroes
"Then if it is successful the council officers are in a strong position to persuade the rest of us," she added.
Around 80 parents, governors and head teachers attended the meeting at Ysgol Dyffryn Nantlle, Penygroes.
Gwynedd council officers did not attend the meeting but earlier the head of schools Gwynne Jones defended the council's handing of the consultation process.
He said the council was going to great lengths to include as many people as possible in the process which had begun since the beginning of the year.
"We have been working with the schools service to look for a model that best suits the local need," said Mr Jones.
A series of meetings had been arranged throughout the county to explain the council's plans, with more scheduled for September, he added.