The process of identifying and retrieving information that is necessary to support legal decision making, legal research has a formalized course of action that begins with an analysis of the facts of a problem or case and concludes with the application and communication of the results of the investigation. Generally speaking though, legal research involves finding primary sources of law in a particular jurisdiction, searching secondary authority (i.e. legal literature) for background information and searching non legal sources for investigative or supporting information.
Research conducted on the first instance is via the Open Web technique i.e. using Google/Bing that does a General background research which is not necessarily authoritative. This first research conducted and the intensity in which this is carried out depends completely on the Case File provided by the client. The more equipped with facts and documents supporting the assertions the better the prosecution or defence drafted with relevant precedents to strengthen the case.
Secondly , Secondary sources of information may be relied upon such as sources of information that interpret the law viz. law review articles and legal writings generally used to persuade the court to reach a particular decision in the given case/matter.
Thirdly and most importantly, reliance on Primary sources of information ,which are documents that establish the law on a particular issue, such as a case decision or legislative act.
Thus as simple as it may sound the firm relies on this 3 Fold Technique or Pyramidisation allows maximum efficiency in dealing which each matter exclusively and reliably.