Judicial review in New Zealand serves to ensure that government actions are in accordance with the law, determine the constitutionality of legislation, and protect the rights and freedoms of individuals.

The High Court in New Zealand is the primary court responsible for conducting judicial reviews.

The main grounds for judicial review in New Zealand include illegality, irrationality, and procedural impropriety.

The principle of legality in the context of judicial review encompasses all of the above requirements.

The principle of irrationality in the context of judicial review encompasses all of the above requirements.

The principle of procedural impropriety in the context of judicial review encompasses all of the above requirements.

The court can grant a declaration of invalidity, injunction, mandamus, or other appropriate remedy in a judicial review proceeding.

Judicial review plays a crucial role in New Zealand's constitutional system by ensuring that the government is accountable to the law, protecting the rights and freedoms of individuals, and promoting the rule of law.

Judicial review contributes to the separation of powers in New Zealand by ensuring that the judiciary is independent from the other branches of government, preventing the government from encroaching on the powers of the judiciary, and promoting checks and balances among the branches of government.

Judicial review in New Zealand faces challenges such as the limited scope of judicial review, the deference given to government decisions, and the lack of resources for judicial review proceedings.

Judicial review in New Zealand has evolved over time with the scope of judicial review expanding, the courts becoming more willing to scrutinize government decisions, and the remedies available in judicial review proceedings being broadened.

Some of the landmark judicial review cases in New Zealand include New Zealand Maori Council v Attorney-General (1987), R v Oakes (1986), and Minister of Immigration v Teiti (1993).

Judicial review in New Zealand is generally considered to be as effective as judicial review in other common law jurisdictions in protecting individual rights and ensuring accountability of the government.

Recent developments in judicial review in New Zealand include the enactment of the Judicial Review Act 2016, the increasing use of judicial review by public interest groups, and the growing awareness of the importance of judicial review among the public.