System Designing Tools:

During system design process system analysis prepared the designs which explains how the system will be developed, how will it work, what are the different components of the system, etc. for the designing process different tools are used. Some of the tools are mention as below:
Algorithm
Flow chart
Pseudo code
Decision Table
Decision Tree
Context Diagram
Data Flow Diagram
Prototype
E.R. Diagram

Algorithm:
Algorithm is a step by step description of a process to solve a problem or a program. It contains finite numbers of steps and it should be easily understandable. Each and every works that we do in our real life, whether it is simple or complex has some pre–defines steps. Such steps for solving task is, in general terms, called algorithm. So, an algorithm is a finite step of instructions that, it followed, accomplishes a particular task. An algorithm is composed of s finite set of steps, each of which may require one or more operation.

One example: input radius and display area and circumference of a circle.
Step 1: Start
Step 2: Input the radius of a circle.
Step 3: Calculate Area = pie r squire
Step 4: Calculate Circumference: 2 pie r
Step 5: Display Area and Circumference of a circle.
Step 6: Stop or End.