HOW TO WRITE SRS

SRS is a detailed description of the system's purpose functionality interface and performance criteria read this article further to know more about the structure of this document but first let's review the reasons for using it. What are the explanations for using an SRS document. SRS describes how a software should be developed. It provides everyone involved with a roadmap for that project SRS and software engineering creates the basis for all documentation. It sets your communication on the proper track helps you understand the merchandise . SRS documentation helps to grow your development standards and it helps to cover risks on each development stage because things could change in the working environment. Your SRS document should be flexible enough to permit for updates. Now about the structure of an SRS document we'll take a look at how each fragment of the file comes in handy during the actual project for us and what parts we consider the most important ones.

1. Introduction
2. Description
3. System features and Requirements

Introduction

So how to prepare an SRS document the first point is introduction it consists of five sections such as purpose, document, conventions, intended audience and use scope and the last one is references. 

Description

The second point is the overall description which includes product perspective and features, user classes and characteristics, operating environment, design and implementation constraints, user documentation and finally assumptions and dependencies.

System features & Requirements

The third point is system features and requirements. Here we write more in-depth description than in the previous two points. So its sections are functional requirements describe functionality from the user's perspective. It involves a detailed description of how the feature works how it reacts to errors, which data it needs to verify etc. You can see an example now external interface requirements describe page elements that will be visible to the end client depending on the project they can consist of four types such as one user interface, two software interface, three hardware interface and four communication interface. This part is usually handled by designers instead of developers. System requirements describe the conditions necessary for the product to run usually they refer to hardware limitations and characteristics and finally non-functional requirements which set the criteria according to how the system has to function for many teams. This section of an SRS is that the most challenging one.

SRS Tools

Tools for SRS documentation. we are excited to share our favorites used in SRS creation and further product management.. 

Context Diagram

Number one is the context diagram it collects all the components in the system into a bigger picture. We think that the significant advantage of a context diagram is providing clear visual representation. 

Function Decomposition

Number two is functional decomposition this tool presents a hierarchical view of the system. So you see which features are more important than others and understand the dependencies in the project.

Use Case Diagram

Number three is use case diagram this tool displays relations between users and features. So in this diagram each user is seen as an actor who interacts with various features.

Sequence Diagram

 Number four is a sequence diagram it shows how functionality and system develop over time. In the sequence diagram you will identify how an actor moves through the system and what changes happen.

2B Process

Number 5 is as is and 2b process model as is diagram describes current processes. What is important is that it helps the entire team to understand how things are done in the current solution identify problematic areas and risks on the other hand the 2b process model shows how existing processes can be revolutionized within your software.

User Stories

Number 6 is user stories which describe actions that a user can perform with the application you can start with writing epic user stories that refer to general activities under normal conditions.

Mind Map

Number seven and our most used tool is mind map one of our favorite advantages of mind mapping is that it keeps the brainstorming process creative what is exciting sketching and filling out a map is spontaneous and it feels tons less sort of a typical documentation activity. All in all a system requirement document is the cornerstone of your products long-term success.