A federal judge struck down the Donald Trump administration’s plan to require some people to work for their Medicaid benefits. Another judge halted Trump’s plan to open Arctic waters to drilling. Yet another ordered an end to what critics said was the administration’s efforts to encourage an end run around the Affordable Care Act. All in the span of about a week.

Rules of criminal or civil procedure govern the conduct of a lawsuit in the common law adversarial system of dispute resolution. Procedural rules are constrained and informed by separate statutory laws, case laws, and constitutional provisions that define the rights of the parties to a lawsuit (see especially due process), though the rules generally reflect this legal context on their face. The details of the procedure differ greatly from jurisdiction to jurisdiction, and often from court to court even within the same jurisdiction. These rules of the particular procedures are very important for litigants to know, because the litigants are the ones who dictate the timing and progression of the lawsuit. Litigants are responsible to obtain the suited result and the timing of reaching this result. Failure to comply with the procedural rules may result in serious limitations that can affect the ability of one to present claims or defenses at any subsequent trial, or even promote the dismissal of the lawsuit altogether.
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