While 39% of organizations use Hadoop as a data lake, the popularity of this use case will fall by 2% over the coming three years. The next step is to define the use case at a low level of detail. Use case diagram provides a graphical overview of goals (modeled by use cases) users (represented by actors) want to achieve by using the system. Description: A brief textual description of what the use case does. The CASE statement goes through conditions and returns a value when the first condition is met (like an IF-THEN-ELSE statement). Sample Use Case Example. They show the amount of details that you need to provide for your Requirements Model, i.e., Phase I of the project. This quick use case definition allows for agile development of use cases. It would help us to understand the role of various actors in our project. A description for the example would be “This use case description outlines the steps for a student manager to review a student request and approve or deny the request.” Created by: The author of the use case. Various actors in the below use case diagram are: User and System. Related use-cases can be grouped in the hierarchy. Use Case #1 (From a student group project on Car Rental Application) Use Case Name: Release a Vehicle (to a Customer) Summary:  Customer intelligence leads the list of Hadoop projects. So, once a condition is true, it will stop reading and return the result. This is also known as a use case brief. Use Case Name: Place Order.  Runtime environment for advanced analytics, memory for raw or detailed data, and data preparation and integration are top 3 use cases for Hadoop. Use-Case ID − Give each use-case a unique numeric identifier, in hierarchical form: X.Y. The first step in defining a use case is to define the name, using the verb-noun naming convention. Below are 2 sample use cases for your reference. Functional requirements can be traced back to a labelled use-case. This example shows the Withdraw Cash Use Case Report, after the first version (UC 3-1) has been structured to omit details that are now found in • UC4-2 Identify Customer Use Case Report • Revision 2. Just about every project manager has the need to develop a Use Case Document, this template is provided as a starting point from which to develop your project specific Use Case Document. Version 1.0 . Introduction This is an example of what a structured use case report might look like. Use cases in a use case diagram can be organized and arranged according to their relevance, level of abstraction and impacts to users. Use Case Report: Withdraw Cash . If no conditions are true, it returns the value in the ELSE clause. For example, if you were writing a use case implementing software to create purchase orders, topics that would be In would include producing reports about requests, merging requests to a purchase order, monitoring deliveries, and new and existing system software. Below is a sample use case diagram which I have prepared for reference purpose for a sample project (much like Facebook). The Use Case Document ties the business needs of a system to the design and implementation of the system. Use-Case Name − State a concise, results-oriented name for the use-case. You will learn how to do this in other articles. Use Case Diagram. Select the use case diagram Broadcasting System from the Diagram Navigator. Use case ID: A unique identifier used for tracing. The SQL CASE Statement. For example, you can create a custom template to output a table of actors' details, and then a list of use cases, and then a list of sub-diagrams. Whilst each of these is unique per report, the basic use case is identical, and writing a use case per report (eg Generate Quarterly Sales Report), for a system that may have 100’s, seems wasteful.