---
title: What is Software Testing Technique? 
description: "**What is Software Testing Technique? ** Software Testing Techniques are systematic approaches used to design test cases to identify defects in software applications. These techniques help testers ensure that software behaves as expected under various conditions. ***5 Important Software Testing Techniques***…"
url: "https://vinothqaacademy.com/docs/what-is-software-testing-technique/"
updated: "2025-02-23"
category: QA Software Testing
tags:
  - QA Software Testing
---

# What is Software Testing Technique? 

**What is Software Testing Technique? **

Software Testing Techniques are systematic approaches used to design test cases to identify defects in software applications. These techniques help testers ensure that software behaves as expected under various conditions.

***5 Important Software Testing Techniques***

**1. Boundary Value Analysis (BVA)**

- **Purpose**: To test the boundaries of input domains because errors often occur at the edges.

- **How it works**: Test cases are designed to include the minimum, maximum, and values just inside and outside the boundaries.

- **Example**: If an input field accepts values from 1 to 100, test cases would include 0, 1, 2, 99, 100, and 101.

**2. Equivalence Class Partitioning (ECP)**

- **Purpose**: To reduce the number of test cases by dividing input data into classes (partitions) that are expected to behave similarly.

- **How it works**: Inputs are grouped into valid and invalid equivalence classes. One test case is selected from each class.

- **Example:** If an age input field accepts values **1 to 100**, we can divide the values into three classes:

- **Valid class**: 1 to 100 (e.g., test with 25)

- **Invalid class (below range)**: Less than 1 (e.g., test with -5)

- **Invalid class (above range)**: More than 100 (e.g., test with 150)

**3. Decision Table Based Testing**

- **Purpose**: Uses a **table format** to represent different combinations of inputs and their corresponding expected outputs.

- Useful when a system has multiple conditions affecting outcomes.

- **How it works**: A decision table is created with conditions (inputs) and corresponding actions (outputs). Test cases are derived from the combinations of conditions.
- **Example:** A login system that checks:

Correct username & password → Access granted

Incorrect username & correct password → Access denied

Correct username & incorrect password → Access denied

Incorrect username & incorrect password → Access denied

**4. State Transition Testing**

- **Purpose**: Used when a system behaves **differently based on previous actions (states)**.

- **How it works**: Test cases are designed to validate transitions between states based on inputs.

- **Example:** ATM system:

- **Card inserted → Enter PIN → Correct PIN → Access account**

- **Card inserted → Enter PIN → Incorrect PIN (3 times) → Card blocked**

**5. Error Guessing**

- **Purpose**: To identify potential errors based on the tester's experience, intuition, and knowledge of the system.

- There are **no formal rules**, but testers use their judgment based on past defects.

- **How it works**: Test cases are designed to target areas where errors are likely to occur, such as invalid inputs, edge cases, or poorly documented features.

- **Example:** In a registration form, the tester might guess that leaving the email field blank, entering an invalid email format, or exceeding the character limit could cause errors.

***Summary Table:***

| **Technique** | **Purpose** | **Key Focus Area** |
| --- | --- | --- |
| Boundary Value Analysis (BVA) | Test boundaries of input domains | Edge values and boundaries |
| Equivalence Class Partitioning (ECP) | Reduce test cases by grouping similar inputs | Valid and invalid input classes |
| Decision Table-Based Testing | Test complex business logic with multiple conditions and outcomes | Combinations of conditions/actions |
| State Transition Testing | Test systems with state-dependent behavior | State transitions and inputs |
| Error Guessing | Identify errors based on experience and intuition | Likely error-prone areas |