A challenge to the array is an objection to the whole panel of jurors summoned to try a case, rather than to individual jurors. It alleges that the jury panel has been improperly selected, summoned or constituted, for example due to systemic bias, procedural irregularity, or failure to comply with statutory jury selection requirements.In England and Wales and Northern Ireland, challenges to the array are recognised in statute and case law in the context of criminal jury trials, and must usually be based on an allegation that the selection process was not random or was otherwise unlawful or unfair. In Ireland, similar principles apply under the Juries Acts, with challenges directed at the validity of the entire jury panel. In Scotland, the concept is broadly analogous but arises within a distinct statutory and procedural framework governing juries in solemn proceedings.Such challenges are made before the jury is sworn. If upheld, the court may discharge the panel and order a new jury panel to be summoned. They are relatively rare in practice and must be supported by clear evidence of a defect affecting the array as a whole.