Skip to main content

Structured tools and techniques of Data analysis

 Structured analysis and design (SAD) is a methodology used to develop information systems. It utilizes a collection of tools and techniques that facilitate a logical and systematic approach to understanding the system's needs, designing its architecture, and implementing it.

Here are some of the structured tools and techniques used for data analysis in SAD:

  • Data Flow Diagrams (DFDs): These graphical representations depict the flow of data through a system. DFDs illustrate the system's processes, external entities that interact with the system, and the data that flows between them.

    Image of Data Flow Diagram (DFD)Opens in a new windowblog.hubspot.com

  • Entity-Relationship Diagrams (ERDs): ERDs visually represent the entities (data objects) within a system, the attributes of those entities, and the relationships between them. ERDs are particularly useful for modeling data in relational databases.

    Image of EntityRelationship Diagrams (ERD)Opens in a new windowen.wikipedia.org

  • Data Dictionary: This is a centralized repository that defines and documents all the data elements used within a system. The data dictionary provides a consistent and clear understanding of the data's meaning, usage, and format.

  • Decision Trees and Decision Tables: Decision trees are flowcharts that illustrate the sequence of decisions and alternatives made within a system based on certain conditions. Decision tables, on the other hand, systematically document these decisions and alternatives in a tabular format, making it easier to analyze complex decision-making logic.

    Image of Decision TableOpens in a new window
    en.wikipedia.org

These structured tools and techniques are beneficial for data analysis in SAD because they:

  • Enhance communication and collaboration: By providing visual representations of data flow, entities, and decision logic, structured tools promote clear communication and collaboration between system analysts, designers, and developers.

  • Improve data quality: The process of creating data models and documenting data elements in a data dictionary helps ensure data consistency, accuracy, and completeness.

  • Facilitate system design: Structured data analysis tools provide a foundation for designing the system's architecture, including data storage, processing, and retrieval mechanisms.

Comments

Post a Comment

Popular posts from this blog

C++ Functions

C++ Functions A function is a block of code that performs a specific task. Suppose we need to create a program to create a circle and color it. We can create two functions to solve this problem: a function to draw the circle a function to color the circle Dividing a complex problem into smaller chunks makes our program easy to understand and reusable. There are two types of function: Standard Library Functions:  Predefined in C++ User-defined Function:  Created by users In this tutorial, we will focus mostly on user-defined functions. C++ User-defined Function C++ allows the programmer to define their own function. A user-defined function groups code to perform a specific task and that group of code is given a name (identifier). When the function is invoked from any part of the program, it all executes the codes defined in the body of the function. C++ Function Declaration The syntax to declare a function is: returnType functionName (parameter1, parameter2,...) { // func...
Post a Comment
Read more

Understanding Multidimensional Arrays:

  Understanding Multidimensional Arrays: Think of a multidimensional array as a collection of smaller arrays nested within each other, forming a grid-like structure. Each element in the grid is accessed using multiple indices, one for each dimension. Declaration and Initialization: C++ data_type array_name[dimension1][dimension2][...][dimensionN]; // Example: 3D array to store temperatures (city, month, day) int temperatures[ 3 ][ 12 ][ 31 ]; // Initialization in one line double prices[ 2 ][ 3 ] = {{ 1.99 , 2.50 , 3.75 }, { 4.20 , 5.99 , 6.45 }}; Use code  with caution. content_copy Accessing Elements: Use multiple indices within square brackets, separated by commas: C++ int first_temp = temperatures[ 0 ][ 5 ][ 10 ]; // Access temperature of city 0, month 5, day 10 prices[ 1 ][ 2 ] = 7.00 ; // Update price in row 2, column 3 Use code  with caution. content_copy Important Points: Dimensions:  The total number of elements is calculated by multiplying the dimen...
Post a Comment
Read more

Economic, Financial

Economic and financial systems are crucial components of any organization, be it a for-profit business, government agency, or non-profit institution. These systems are used to track income and expenses, manage budgets, analyze financial performance, and make informed economic decisions. System analysis and design (SAD) is a methodology used to develop, improve, and maintain these economic and financial systems. It involves a series of steps, including: Identifying the need:  The first step is to identify the need for a new or improved economic and financial system. This could be driven by a number of factors, such as the need to improve efficiency, accuracy, or compliance with regulations. Understanding the current system:  Once the need has been identified, the next step is to understand the current system. This involves gathering information about how the system works, what data it collects, and who uses it. Defining requirements:  Based on the understanding of the cur...
Post a Comment
Read more