Law reform is defined as a process of reviewing our existing laws, and recommending or introducing changes to them to improve justice or efficiency. Basically, this just means that there may be some situations in which there is no law covering a particular area of society, or where the existing law is inadequate and doesn't work as it should, leading to unfair outcomes for certain people, for example, victims or accused persons, or society as a whole.
Thus, after looking at these failures in the law, which may come to light on a case-by-case basis, or come out in media articles, lobby groups and interested parties can pressure the government into addressing the problems with the law by creating new laws, or amending existing laws. The process of law reform is designed to better cater for society's needs, and make sure that the legal system is operating properly for the protection of society, and achieving just and fair outcomes for all parties.
In the Legal Studies sense, looking at law reform in essays or exam style questions would involve knowing:
-The area of the law that needs reforming or changing
-Agencies for reform, like law reform commissions or parliamentary committees, who identify areas where the law isn't working, or where new laws need to be made, such as new and emerging DNA technologies
-Mechanisms for reform, especially parliament and the courts, who pass new laws or update laws in response to failures of existing law or changing concepts of justice
-Any subsequent reviews of the law, evaluations by law reform commissions, or media articles that highlight whether the law reform, or change, has been effective or ineffective
Hope this helps, and if you have any other questions, feel free to ask