I would like to discuss a task similar to “The collaboration changed. Agree the next stage.”

The source of the difficulty still needs clarifying.

Possible first output: A short review of changes and questions for agreeing the next partnership stage.

I would like to check whether this first step fits our task and discuss terms for further work.

Our situation: [add details]
What we want to change: [add details]
What we have tried: [add details]