Functional Testing｜Software Testing｜QA Services

Are your systems performing “Chanto” — exactly as expected?

Functional testing is a type of testing that verifies whether software correctly executes its functions according to the specifications. It focuses primarily on “what” the system does and checks its behavior from the user’s perspective.

Our functional testing service leverages our extensive track record in quality improvement. Our JSTQB-certified QA engineers thoroughly verify that your systems and services function exactly as expected — the “Chanto” way.

Why Choose Us
Our Services
Our Process

Why Clients Choose Us

Even Without Specifications

Deriving an optimal testing approach through interviews and hands-on verification.
Even if your specifications are incomplete or outdated, you can rest assured. Our engineers identify the intended behavior of your software through interviews, hands-on verification, and source code analysis. This approach reduces your documentation workload and enables a smooth start to testing.

ISTQB Partner

High‑quality testing based on global software testing standards.
As a partner company of ISTQB, the international software testing qualification board, our engineers bring structured, advanced expertise to your project. This ensures highly comprehensive, evidence‑based testing aligned with global testing standards.

Extensive Experience and Broad Domain Knowledge

Ensuring system validity through deep understanding of business logic.
Our engineers possess specialized expertise across a wide range of industries, including finance, insurance, manufacturing, retail, logistics, advertising, real estate, and healthcare. This deep, domain‑driven knowledge enables us to deliver highly accurate testing aligned with business priorities—even when verifying complex calculation logic and conditional branches.

Service Overview

As an IV&V company, we handle the full lifecycle of functional testing across various testing levels—from test planning and analysis to design, implementation, and execution.
We can also provide support for individual phases only, such as test execution.

For test design, we combine the following testing techniques to ensure comprehensive and efficient coverage.

Functional Testing Techniques We Use

Equivalence Partitioning: Divides valid and invalid inputs into groups, testing a representative value from each partition. This reduces the number of test cases while maintaining high coverage.
Boundary Value Analysis: Focuses on testing the boundaries of inputs such as maximums, minimums, and values just inside or outside the boundaries. This is an effective technique based on the empirical rule that defects frequently occur near boundaries.
Decision Table Testing: Organizes combinations of conditions and corresponding actions into a table to derive test cases. Particularly effective for complex logic.
State Transition Testing: Defines software states and transitions, then verifies that transitions occur correctly. This technique is well-suited for testing user interfaces and workflows.
Use Case Testing: Derives test cases based on use cases that describe user interactions with the system. This enables testing aligned with actual usage scenarios.
Exploratory Testing: A technique in which testers simultaneously learn about the system, design tests, and execute them, leveraging their knowledge, experience, and intuition without predefined test cases. This is effective for uncovering unexpected defects.

Our Process

①

Quality Assessment and Consultation

• Understanding the target service
• Identifying quality issues
• Proposing solutions to address quality issues

Output:
• Quality improvement proposal

②

Test Planning

• Clarifying test objectives
• Defining the test approach
• Updating the test plan
• Considering test automation

Output:
• Test plan

③

Monitoring and Control

• Collecting metrics
• Tracking progress
• Controlling the overall test process

④

Test Analysis

• Analyzing the test object based on the test basis
• Extracting and defining test conditions

Output:
• Test design specification

⑤

Test Design

• Applying test techniques (Equivalence Partitioning, Boundary Value Analysis, Decision Table Testing, Pairwise Testing, State Transition Testing, Orthogonal Arrays Testing, etc.)
• Designing the test architecture
• Creating detailed test designs

Output:
• Test specification

⑥

Test Implementation

• Creating test cases
• Creating test procedures
• Creating test suites
• Setting up the test environment

Outputs:
• Test cases
• Test procedures

⑦

Test Execution

• Executing tests
• Verifying fixes

Outputs:
• Test logs
• Incident reports (critical incidents are reported immediately)
• Progress reports

⑧

Test Completion

• Reporting test results

Outputs:
• Test summary report
• Quality improvement proposal

Staying Ahead of the Latest QA Trends

We regularly host Ques, a specialized event for QA engineers, to stay updated on the latest QA trends from various companies and continuously enhance our skills and services.