A complicated decision is scattered across short messages. You answer one point while another arrives, and neither person can tell which question remains open.
Suggest a call, shared document or another suitable channel. Explain the practical reason: the decision has several parts, the material needs review or the subject should be private. Check that the proposed medium is accessible to the other person.
Bring the open questions
List the points still requiring an answer before moving. A new channel should help finish the conversation, not require everyone to start again. Keep any decision record in the place the group normally uses.
If the person cannot use the proposed channel, ask what alternative would work. You may be able to organise the written exchange with numbered questions or a concise summary. The useful change is one that makes the task easier to follow for the people involved, including those who need time to read and respond carefully.
