Best practices for stakeholder consultation during policy review?

We've found success with a tiered consultation approach: 1) Policy owners and subject matter experts get detailed drafts for line-by-line review, 2) Affected department heads receive executive summaries highlighting key changes and impact, 3) End users participate in focused surveys or brief feedback sessions on specific operational questions. We also use "consultation windows" of defined timeframes (typically 2-3 weeks) to prevent endless back-and-forth while ensuring adequate input.