A liquid agenda system is a system which allows any participant to:
- propose issues or problems to be solved (referred to here as "questions")
- propose any number of solutions or preferred outcomes for each question (referred to here as "answers")
- rate each proposed solution on a semicontinuous scale which allows both negative and positive indications (i.e. range voting)
- the vote would ideally be handled by something like weighted proxy voting
The individual ratings can then be summed up and acted upon according to whatever algorithm or process has been previously deemed appropriate by the votership.
There is a more technical discussion on HTYP.
The purpose of this system is to prevent any individual group from controlling the agenda, and hence limiting the possible outcomes only to those they find acceptable -- thus effectively controlling the decisionmaking process while providing the appearance of choice.