Exploratory Testing: What It Is and How to Practise It

Exploratory Testing: What It Is and How to Practise It

Exploratory testing is an approach to testing that doesn’t follow pre-written scripts: the tester uses the software and thinks at the same time, deciding what to try next. It helps find bugs that test cases tend to miss and assess how easy the software is to use, so it is usually run alongside scripted testing. It is also an easy technique for beginners to practise, with no tools or programming knowledge required.

What is exploratory testing?

In scripted testing, the tester follows steps written in advance and compares the results with what was expected. Exploratory testing works differently: designing tests, running them and learning about the product all happen at the same time. The tester uses what they have just observed to choose the next step. One article on QA trends notes that this approach helps ensure the software is not only functionally correct but also intuitive and user-friendly. [1] kualitee

It is important to tell it apart from aimless clicking around. Exploratory testing still has a goal, a time limit and notes. These three elements turn curiosity into a disciplined way of working, and they let you report back on what you explored.

How a session works

A session usually follows these steps:

1. Set a short goal, for example “explore the ordering feature and look for weak spots.” A goal keeps you from wandering off while staying broad enough to try many directions.
2. Set a time limit, typically 30 to 90 minutes. When time is up, stop, wrap up, and only then decide whether to continue.
3. Take notes as you go: what you tried, what went wrong, what questions came up. Notes let you repeat your steps and explain them to others.
4. Try “unusual” actions that real users might take: entering odd data, clicking repeatedly, going back midway, resizing the screen, losing the connection mid-action.
5. Wrap up: record the bugs, what you learned, and whether another session is needed.

When you hit a bug, write down the steps to reproduce it right away, because a few minutes later you may not remember exactly what you clicked. If one area produces many bugs, that is usually a sign to spend more time there.

A useful habit is to write your goal as one short sentence in the form “explore X using Y to discover Z”, for example “explore the shopping cart using unusual quantities to discover calculation errors.” This keeps the session focused without turning it back into a script. Afterwards, spend a few minutes reviewing your notes: which areas felt solid, which felt fragile, and what you did not get to.

When to use it, and its limits

This approach is especially effective when requirements are missing or unclear, when you need to find bugs quickly before test cases are written, or when you need to evaluate the user experience, which scripts struggle to cover. One source advises prioritising high-risk areas and combining manual exploratory testing with automated testing. [2] ambalait

It also has limits. The results depend on the tester’s experience and curiosity: two people exploring the same feature may find different bugs. Without notes, it is hard to repeat exactly what was done, and hard to show others that an area has been checked. For this reason, exploratory testing should accompany scripted testing rather than replace it entirely. A practical approach is to use scripts for important flows that need repeated checking, such as login or payment, and use exploration to find what the scripts did not anticipate.

Background: why this technique gets mentioned so often

Many beginners only run the test cases they are given. When requirements change quickly or documentation is lacking, this approach can easily miss bugs in situations nobody wrote down. Meanwhile, the definition of quality is getting broader: testing now commonly includes checks for accessibility and inclusive design. [3] These aspects are hard to capture fully in scripts written in advance, so testers need to be able to observe and ask questions. tsg-training

The “shift-left” trend (testing earlier) also makes exploratory testing more useful. When testers get involved from the start, they often have to test features that don’t yet have complete documentation. Goal-directed exploration is a practical way to learn about the product and find risks at the same time.

What it means for people new to the field

Exploratory testing is a good place to start for several reasons:

• No tools or coding needed. All you need is an application and a notebook.
• It trains the tester’s mindset. You learn to ask “what if the user does this?”, a foundational skill for every path you take later, including automation.
• You can practise right away on familiar apps. Food delivery, banking, or social media apps all work.
• It’s easy to turn into something shareable. A report on one exploration session, including the bugs found and what you learned, is good material for a blog post or personal portfolio.

A simple way to practise: pick one small feature, set a 30-minute timer, and record just three things: what you tried, what looked odd, and what you still want to try. For example, with an account sign-up form you could try an email without the “@” symbol, a very long password, leaving each field empty in turn, pasting special characters, or pressing the sign-up button twice in a row. After a few sessions, you’ll start to notice the kinds of bugs that keep recurring. Common beginner mistakes are testing only the main path, forgetting to take notes, and stopping after the first bug. Treat the first bug as a clue rather than the end: bugs often cluster, so look nearby for related problems.

Exploratory testing is also an experience-based technique covered in the ISTQB Foundation syllabus. So learning it helps with your day-to-day work and is a stepping stone if you later want to earn the certification.

References

1. Kualitee, “The Future of QA: Trends That Will Shape Software Testing in 2026”: https://www.kualitee.com/blog/qa-testing/qa-trends-in-2026/
2. Ambala IT, “Software QA Testing in 2026: Best Practices, Tools & Strategies for Web and Mobile Apps”: https://ambalait.com/blogs/software-qa-testing-in-2026-best-practices-tools-strategies-for-web-and-mobile-apps
3. TSG Training, “Top Software Testing & QA Trends for 2026”: https://tsg-training.co.uk/?p=130041

Further reading (to cross-check with the official syllabus): ISTQB, Certified Tester Foundation Level Syllabus v4.0.1: https://www.istqb.org/wp-content/uploads/2024/11/ISTQB_CTFL_Syllabus_v4.0.1.pdf