Myth of Multitasking, Second Edition: How Doing It All Gets Nothing Done by Dave Crenshaw Summary

1. Multitasking is a myth that reduces productivity and increases stress according to Dave Crenshaw.
2. Switchtasking wastes time through constant attention shifts between unfinished tasks.
3. Prioritizing tasks by importance saves 25% more time than multitasking attempts.
4. Single-tasking completes work 40% faster with fewer errors than divided focus.
5. Background tasking—not switchtasking—maximizes productivity during unavoidable waiting periods.
6. Every task switch adds hidden time costs that compound throughout the day.
7. Dave Crenshaw’s “focus funnel” method triages urgent vs. important tasks effectively.
8. Multitasking damages workplace relationships through constant partial attention to colleagues.
9. Creating “switchtasking-free zones” protects deep focus for critical thinking work.
10. The mental cost of multitasking equals 20 IQ points according to Crenshaw’s research.
11. Dave Crenshaw’s single-tasking method saves 90 minutes daily through concentrated effort.
12. “Doing it all” mentality prevents meaningful progress on high-value priorities.

『Myth of Multitasking, Second Edition』の著者について

Dave Crenshaw, bestselling author of The Myth of Multitasking: How “Doing It All” Gets Nothing Done, is a leading productivity expert and founder of Invaluable Inc., a coaching firm specializing in productive leadership.

His book, a time management classic, challenges the modern obsession with multitasking through neuroscience-backed insights—a theme informed by his personal journey with ADHD, which fueled his mission to create organizational systems for chaotic minds.

A seasoned speaker for Fortune 500 companies and universities, Crenshaw has expanded his reach through LinkedIn Learning courses like Time Management Fundamentals, viewed over 50 million times. His work has been featured in TIME, FastCompany, and BBC News, and he’s authored additional titles such as Invaluable: The Secret to Becoming Irreplaceable and The Focused Business.

Translated into eight languages, The Myth of Multitasking remains a global bestseller, cementing Crenshaw’s role as a trusted voice in personal and professional efficiency.

『Myth of Multitasking, Second Edition』に関するよくある質問

What is The Myth of Multitasking by Dave Crenshaw about?

The Myth of Multitasking debunks the misconception that multitasking improves productivity. Dave Crenshaw argues that what people call multitasking is often harmful "switchtasking"—rapidly shifting focus between tasks, which increases errors, stress, and time spent. The book introduces solutions like prioritizing single-tasking and leveraging "background tasking" (combining mindful and automated tasks) to boost efficiency. Written as a business fable, it blends storytelling with practical time-management strategies.

Who should read The Myth of Multitasking?

This book is ideal for professionals, leaders, and students struggling with focus in distraction-heavy environments. It’s particularly relevant for ADHD individuals, as Crenshaw shares systems he developed to overcome his own "off-the-charts" ADHD diagnosis. Managers aiming to reduce workplace inefficiencies and anyone seeking data-backed methods to reclaim time will benefit.

Is The Myth of Multitasking worth reading?

Yes—it’s a quick, actionable read with global appeal, translated into eight languages and cited in TIME and BBC News. Crenshaw’s blend of humor, real-world examples, and exercises (like the switchtasking test) make complex productivity concepts accessible. Over 50,000 LinkedIn Learning students have applied its principles.

What are the main concepts in The Myth of Multitasking?

Key ideas include:

• Switchtasking: Attempting simultaneous attention-heavy tasks, which incurs "switching costs" (time loss, errors, stress).
• Background tasking: Pairing mindful tasks with automatic ones (e.g., exercising while listening to podcasts).
• Single-tasking prioritization: Structuring workflows to minimize distractions and context-switching.

How does Dave Crenshaw define "switchtasking"?

Switchtasking occurs when you split focus between tasks requiring active attention, like texting during a meeting. Crenshaw’s exercise—timed writing while alternating sentences—proves it takes 20–40% longer versus single-tasking. This concept underpins the book’s argument that multitasking is a myth.

What practical exercises does the book include?

The Myth of Multitasking Exercise challenges readers to write two alternating sentences under timed conditions, revealing the inefficiency of switchtasking. A downloadable worksheet and video tutorial help readers apply this test personally and in teams.

How does The Myth of Multitasking compare to Atomic Habits?

While Atomic Habits focuses on behavior systems, Crenshaw’s book targets task-management mechanics. Both emphasize incremental changes, but The Myth of Multitasking specifically addresses workplace and tech-driven distractions. It’s a shorter, narrative-driven complement to broader habit-building guides.

What criticisms exist about The Myth of Multitasking?

Some reviewers note the business-novel format feels contrived, with an idealized consultant-client dynamic. Others argue it oversimplifies productivity challenges for neurodivergent individuals. However, most praise its actionable advice and relatable anecdotes.

How can The Myth of Multitasking improve workplace productivity?

The book advises teams to:

• Schedule "focus blocks" for deep work.
• Reduce unnecessary meetings and emails.
• Normalize single-tasking to cut switching costs. Case studies show companies adopting these strategies report 15–30% efficiency gains.

Why is The Myth of Multitasking still relevant in 2025?

With remote work and AI increasing digital distractions, Crenshaw’s systems help navigate constant interruptions. Updated editions address hybrid work challenges, making it a staple for corporate training programs at firms like Microsoft and IBM.

What quotes from the book are widely shared?

• “Multitasking is a lie. What you’re really doing is switchtasking.”
• “Productivity isn’t about doing more—it’s about doing what matters, undistracted.” These lines encapsulate the book’s core message, often cited in productivity seminars.

How does Dave Crenshaw’s ADHD diagnosis inform the book?

Crenshaw’s clinical ADHD journey shaped his empathy for focus struggles. He shares tailored systems like timeboxing and environmental tweaks, proving productivity is achievable even with neurodivergence. This firsthand experience adds credibility to his methods.