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                           Doubly Linked List A doubly linked list is a  linked list data structure that includes a link back to the previous node in each node in the structure . This is contrasted with a singly linked list where each node only has a link to the next node in the list. List is a variation of Linked list in which navigation is possible in both ways, either forward and backward easily as compared to Single Linked List. Following are the important terms to understand the concept of doubly linked list. Link  − Each link of a linked list can store a data called an element. Next  − Each link of a linked list contains a link to the next link called Next. Prev  − Each link of a linked list contains a link to the previous link called Prev. LinkedList  − A Linked List contains the connection link to the first link called First and to the last link called Last. Doubly Linked List Representation As per the above illustration, following are the important points to be considered. Dou

  What is Requirements Determination? A requirement is a vital feature of a new system which may include processing or capturing of data, controlling the activities of business, producing information and supporting the management. Requirements determination involves studying the existing system and gathering details to find out what are the requirements, how it works, and where improvements should be made. Major Activities in requirement Determination Requirements Anticipation It predicts the characteristics of system based on previous experience which include certain problems or features and requirements for a new system. It can lead to analysis of areas that would otherwise go unnoticed by inexperienced analyst. But if shortcuts are taken and bias is introduced in conducting the investigation, then requirement Anticipation can be half-baked. Requirements Investigation It is studying the current system and documenting its features for further analysis. It is at the heart of system ana