Smart Multitasking: When It Helps and When It Harms

Multitasking

Smart multitasking means choosing the right tasks to combine, not just doing more things at once. Multitasking can often lower productivity, but some tasks can be paired safely if they use different types of mental effort. Understanding this can help you stay focused and perform better.

Multitasking is often painted as the villain of productivity.
You hear it everywhere:

“Multitasking is bad.”
“It ruins your focus.”
“It harms your brain and mental health.”

It’s true, humans can’t do two or more demanding mental tasks at the same time. Research shows that multitasking actually lowers both productivity and the quality of your work.

But that is not the full story. In some situations, multitasking can be both safe and beneficial. Understanding the contexts in which it works best enables effective multitasking. There are ways to combine tasks without hurting your focus, productivity, or well-being.

In this insight, you’ll learn about:

Why multitasking is usually unproductive.
The difference between low-load and high-load tasks.
When is it safe to multitask?
Rules for better, smarter multitasking.

Multitasking often reduces productivity and work quality.
Pairing low-load tasks or a low-load task with a high-load task can be safe.
A quick mental checklist helps decide when multitasking is appropriate.

Why is Multitasking Generally Considered Unproductive?

Even if it feels like you’re doing two things at once, your brain isn’t actually working on both in parallel. Instead, it quickly switches back and forth between them. This is called “task switching”.

When you try to multitask, your brain switches tasks thousands of times without you noticing. This can hurt your productivity, your brain, and your mental health.

To learn more about what happens in the brain when you switch tasks, check out the insight article on the science behind multitasking.

A study by the American Psychological Association found that task switching can reduce productivity by up to 40%, highlighting the cognitive cost of juggling multiple tasks.

But there’s a way to avoid this harm, at least to some extent. First, you need to understand how different tasks use your mental energy.

To keep things simple, we can sort everyday tasks into low-cognitive-load and high-cognitive-load categories based on the mental effort they require.

Two Types of Tasks

Tasks that require low cognitive load

These tasks usually don’t need much effort or focus to complete well.

You don’t need creativity or problem-solving for these tasks—they often feel simple and automatic.

Low-load tasks include simple physical actions, background activities, and habits.

Such as,

Simple physical tasks: doing dishes, walking, jogging, and wiping a table.
background activities: listening to instrumental music and tidying a room.
Habitual tasks: folding laundry, routine driving, and treadmill workouts.

These tasks are easy, and you don’t have to think about every step to get them done.

You can safely multitask with these kinds of tasks. Imagine tying your shoes while chatting with a friend—these activities are often automatic and don’t require much mental focus, allowing you to combine them without difficulty.

But high-load tasks are a different story.

Tasks that require high cognitive load

High-load tasks are much more demanding. They need deep thinking, focus, and creativity. When you do these, your brain works hard to keep your attention steady and sharp.

If you switch away from a high-load task before finishing, it’s hard to pick up exactly where you left off. That’s when multitasking starts to cause problems.

This type of task includes

studying,
writing,
coding,
listening to a song,
problem-solving, and
active listening.

If you start replying to emails, you might miss your boss announcing a major decision. That lost sentence could change your whole day.

Sweet Spot of Multitasking

The brain’s bottlenecks dictate these guidelines, guiding us towards efficient multitasking. The best way to multitask is to combine two low-load tasks, or pair a low-load task with a high-load one.

But you shouldn’t just pair any tasks together. Not every combination is safe or productive.

That’s why it helps to have some clear rules.

Rules for Smart Multitasking

You might think you already know these rules, but it’s not always that simple. Let’s take a closer look.

1. Pair two low-load tasks

This is probably what you guessed—it’s the most obvious and common way to multitask. Since these tasks need little thinking and focus, you can usually combine two of them safely.

Once a task becomes a habit or feels automatic, it takes up less mental effort. That leaves you with enough brainpower to handle another simple task at the same time.

Most of us multitask like this every day. It’s usually harmless, as long as it doesn’t put anyone’s safety at risk.

Examples are:

Drinking tea while scrolling through your phone.
Tidying a room while chatting casually.
Washing dishes while listening to light music.
Walking slowly while texting short messages.

2. Pair a high-load task with a low-load task

Research on automaticity has shown that once a behavior becomes procedural and habitual, it needs very little attentional control, minimal prefrontal cortex activity, and almost zero working memory (see Logan, 1988).

In this case, the low-load task doesn’t compete for your attention, so the high-load task still gets most of your focus.

That’s why you can do things like:

Think while walking.
Listening to a song while doing dishes.
Do office work while sipping coffee.
Folding laundry while watching an engaging video.

3. Never do two tasks that use the same sensory

If two tasks both use the same sense, your brain has to keep switching focus between them. For example, you can’t really listen closely to a podcast and a song at the same time. Your brain switches back and forth, so you miss details from both.

Consider reading two novels simultaneously. The competition for the same sensory channel makes it nearly impossible to follow either story, and you’re likely to mix up plotlines and characters, illustrating the chaos that arises when you overload one sense.

Likewise, don’t,

Scroll social media while studying, reading, or driving.
Listen to music during lectures, to podcasts, and while watching educational videos.
Calling during a meeting

4. Never combine high-load tasks together

Don’t let your tasks compete for your brain’s attention. Studies show that doing two high-load tasks at once lowers your performance, causes more mistakes, slows you down, and overloads your memory.

It’s been quantified that error rates can rise by up to 50%, emphasizing the tangible risks involved. Overall, this is bad for both your productivity and your health.

So, don’t combine,

Replying to complex emails while in an important meeting.
Listening to lyrics-heavy music while studying.
Typing a report while your mind is wandering deeply into unrelated thoughts

5. Safety first

Some combinations aren’t just unproductive. They can be dangerous.

Avoid multitasking when your safety or others’ safety depends on your full attention, such as:

Mind wandering or scrolling social media while driving.
Mind wandering or listening while cooking.
Handling hot liquids while checking your phone.

If a small mistake could cause an injury, it’s best to focus on just that one activity.

6. Think before paring tasks

This is the most important rule. Now you know which task pairings are risky. But remember, your life and tasks are unique, so not every example will fit you exactly.

So, make it a habit to pause and think:

Does at least one of these tasks need deliberate, steady focus?
Do they both use the same primary sense?
Is one of the habits still new and not yet automatic?
Is it dangerous to combine?

If the answer is “yes” to any of these, do not multitask.

Why shouldn’t you pair a new habit with another task?

It’s simple: if you combine a habit you’re still learning with a demanding task, you’ll hurt both your performance and your ability to build the habit. Habits typically take around 21 to 66 days to become automatic, depending on their complexity and frequency.

For example, if you are new to the gym, your workouts still need attention to form and technique. Adding a podcast may distract you just enough to cause you to learn the movement incorrectly. The habit can be built in the wrong way.

10-Second Scan

Before diving into multitasking, take a moment to perform this brief ritual:

Does one task run almost on autopilot?
Does the second task demand low or no attention?
If interrupted, would either task lose an important quality?
Does doing these tasks together make you feel calm rather than stressed?

Take-Home Message

You can’t change how your brain is built. It’s designed for focused work, not for handling multiple demanding tasks at once. Choose focus when it counts and leverage your brain’s strengths effectively.

This empowers you to achieve more with clarity and intention. However, in real-world scenarios, many roles demand some level of multitasking due to high pressure and various responsibilities.

In such cases, it’s crucial to find ways to minimize potential harm. Consider prioritizing tasks, scheduling focused work periods, and taking regular breaks to manage your mental load effectively.

You can safely multitask when:

One or both tasks are low-load.
They do not compete for the same sense.
Your safety and long-term health are not at risk.

Multitask only when it’s gentle and safe. Save your deep focus for the things that really matter.

Frequently Asked Questions (FAQs)

Is multitasking always bad for productivity?

No. Multitasking is mostly a problem when both tasks are mentally demanding. Pairing a high-load task with a low-load, automatic one (like walking or washing dishes) is usually safe and can even be helpful.

Can I listen to music while studying?

It depends on the music. Instrumental or soft background music might be fine for some people. But lyrics often use the same language systems you need for reading and writing, which can hinder your understanding and memory.

Is walking while listening to a podcast considered multitasking?

Yes, but it’s usually safe. Walking on a familiar, low-risk route is a low-load, automatic task, so your brain can focus more on listening to the podcast.

How do I know if multitasking is hurting my performance?

If you often find yourself rereading the same sentence, missing key points in conversations or meetings, feeling tired after simple tasks, or making more mistakes than usual, multitasking might not be working for you. These signs suggest your mind is overloaded, so it may help to focus on one task at a time.

Why is the brain unable to perform two demanding tasks simultaneously?

The brain possesses limited attentional and working memory capacity. When two demanding tasks require the same cognitive resources, the brain processes them sequentially rather than in parallel. It rapidly alternates between tasks, a phenomenon known as task switching. Task switching imposes cognitive costs, increases the likelihood of errors, and reduces overall efficiency, resulting in decreased performance during complex multitasking.