As more and more leading technology companies are transforming from the traditional waterfall development model to an Agile software methodology, requirements engineering provides a process that enables engineers to software to understand the problems they need to solve ( Martin, Newkirk, & Koss, 2014 ). It is critically important to understand the customer's wants and needs before starting to design or build the computer-based solution, as developing a solution that ignores the customer's needs provides no value to any of the parties involved. Therefore, the intent of requirements engineering is to produce a written understanding of the customer's problem (Pressman, 2010). Work products available to communicate this understanding include user scenarios, feature and function lists, analysis models, and specifications. This document provides an evaluation of requirements patterns, an evaluation of the most effective troubleshooting techniques, a descriptive explanation of the patterns that includes a visual taxonomy, and an explanation of how the identified patterns are related. Requirements Engineering Requirements engineering begins during the communication activity, continues into the modeling activity, and builds a bridge from system requirements to software design and construction. Through requirements engineering, the context of the performed software work is examined. It is essential that the software engineering team understands all the requirements of a problem before the team tries to solve it. Also included is identification of the specific needs that design and construction must meet. A further need is to identify the priorities that guide the order of completion of the works. This is… half of the article or user feedback, related models and similar approaches for possible solutions to this problem, and source code (Hagge and Lappe, 2005). Requirements Templates for Mobile Phone Software Issue. Relationship between models It is important to understand that models are not independent entities. Design patterns present at a high level of abstraction will influence how other patterns at lower levels of abstraction are applied. Furthermore, models often collaborate with each other. This implies that the selection of an architectural pattern will likely influence the choice of component-level design patterns, which have the greatest effect (Pressman, 2010). Additionally, if you select a specific interface design pattern, this may result in the need to use other patterns that collaborate with it.