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Don't Make Me Think

Don't Make Me Think, Revisited: A Common Sense Approach to Web Usability is a seminal book on user experience (UX) design and web usability authored by Steve Krug.^[1] First published in 2000 by New Riders, the book presents practical principles for creating intuitive digital interfaces that minimize user frustration and cognitive load.^[2] It emphasizes common-sense strategies for navigation, information architecture, and testing, making it accessible to designers, developers, and product managers.^[1] Steve Krug, a longtime usability consultant, drew from his professional experience to write the book, aiming to distill complex UX concepts into straightforward advice.^[1] The original edition, released on October 13, 2000, spanned 195 pages and quickly gained traction in the burgeoning field of web design. Subsequent editions followed: the second in 2005, updating examples for evolving web technologies, and the third—titled Revisited—in 2014, spanning 216 pages including a new chapter on mobile usability and fresh illustrations.^[3]^[2] The book's core philosophy revolves around Krug's "first law of usability": interfaces should be self-evident, requiring no conscious effort from users to navigate them.^[1] Key topics include optimizing billboards (above-the-fold content), reducing choices to avoid decision paralysis, and conducting affordable usability testing with just a few participants.^[1] These ideas extend beyond websites to mobile apps, desktop software, and even non-digital products like appliances or voting systems.^[1] Since its debut, Don't Make Me Think has sold over 700,000 copies worldwide in 15 languages, establishing itself as a foundational text that introduced UX principles to a broad audience.^[1] Its humorous, illustrated style and focus on actionable insights have influenced generations of professionals, remaining relevant amid shifts like responsive design and app ecosystems.^[1] The third edition, published by New Riders (ISBN 978-0-321-96551-6), continues to serve as an essential primer for creating user-friendly digital experiences.^[2]

Background and Publication

Author

Steve Krug is the founder and principal of Advanced Common Sense, a usability consulting firm based in Chestnut Hill, Massachusetts, specializing in making websites and applications more intuitive for users. With over 40 years of experience as a usability consultant, Krug has worked with a diverse range of clients, including Apple, Bloomberg.com, Lexus.com, NPR, and the International Monetary Fund, focusing on practical improvements to digital interfaces.^[4]^[5] Krug's career began in the 1980s with technical writing and creating computer manuals, sparked by his introduction to computing through a job in typesetting. As the web gained prominence in the 1990s, he shifted to usability consulting, conducting hundreds of usability tests that emphasized real-world observation over theoretical models. This hands-on experience, drawn from early web projects and iterative testing sessions, cultivated his signature commonsense philosophy, prioritizing simplicity and user intuition in design.^[4]^[5] Holding a degree in English literature from college, Krug's education initially started in physics but pivoted due to gaps in the curriculum, such as untaught calculus, leading him toward writing and communication. This background informed his straightforward, engaging writing style and workshop teachings on do-it-yourself usability testing.^[4] Krug's expertise extends to other works, such as Rocket Surgery Made Easy, which builds on his testing methodologies.^[6]

Editions

The first edition of Don't Make Me Think: A Common Sense Approach to Web Usability was published on October 13, 2000, by New Riders, comprising 195 pages and emphasizing foundational principles of web usability during the height of the dot-com boom. This edition, with ISBN 978-0-7897-2310-9, focused on practical advice for designing intuitive websites amid rapid internet growth.^[7]^[8] The second edition appeared in August 2005, also by New Riders, expanding to 216 pages with ISBN 978-0-321-34475-5.^[3]^[9] It introduced three new chapters addressing why users abandon websites, strategies for creating usable and accessible sites, and techniques for conducting usability testing, reflecting evolving user-centered design practices.^[9] The third edition, subtitled Revisited: A Common Sense Approach to Web and Mobile Usability, was published on December 24, 2013, by New Riders (an imprint of Peachpit, part of Pearson Education), totaling 216 pages with ISBN 978-0-321-96551-6.^[10] Key updates included a new Chapter 10 on mobile usability, refreshed examples incorporating smartphones and tablets, and revisions to eliminate or update references to obsolete technologies such as Flash.^[11] These changes were motivated by Steve Krug's ongoing consulting work in usability, adapting the book to contemporary digital landscapes.^[1]

Synopsis

Guiding Principles

Krug's First Law of Usability, articulated as "Don't make me think!", posits that web pages should be self-evident and obvious to users, ensuring that common elements such as links and buttons require no cognitive effort to understand or interpret.^[12] This principle emphasizes designing interfaces where users can intuitively grasp functionality without hesitation, reducing friction in everyday interactions.^[12] In examining user behavior on the web, Krug highlights that people rarely read content fully; instead, they scan pages in patterns resembling an "F," focusing on headings, bold text, and initial segments while skipping dense paragraphs.^[13] This scanning habit stems from the web's fast-paced environment, where users seek quick information retrieval rather than immersive reading.^[13] Complementing this, the concept of satisficing describes how users opt for the first "good enough" option that meets their needs, rather than exhaustively evaluating all choices for the optimal one, as originally theorized by Herbert A. Simon in decision-making contexts.^[13] Additionally, muddling through refers to users' tendency to tolerate ambiguities and improvise solutions to proceed, even when interfaces are imperfect, allowing them to complete tasks despite minor confusions.^[13] To accommodate these behaviors, Krug advocates for "billboard design," where web pages function as visual hierarchies optimized for scannability, employing techniques like bold headings, color contrasts, and generous spacing to guide the eye without demanding linear reading.^[14] This approach treats pages as advertisements meant to convey key messages at a glance, prioritizing clarity over comprehensive detail to align with users' rapid processing.^[14] Krug further notes users' preference for "mindless choices," where interfaces provide straightforward, conventional options that minimize decision-making, such as binary radio buttons instead of intricate forms, thereby avoiding cognitive overload and decision fatigue. These predictable elements foster familiarity, enabling users to act without deliberation. Finally, Krug's Third Law of Usability stresses omitting needless words, drawing from William Strunk and E.B. White's maxim in The Elements of Style to advocate for concise labeling and instructional copy on the web.^[15] This involves stripping away redundant phrases, "happy talk" verbiage, and instructions, ensuring that text supports usability by being direct and essential.^[15] Krug's exploration of design and navigation essentials in "Don't Make Me Think" focuses on creating intuitive structures that minimize user confusion, drawing from real-world web practices to ensure seamless orientation and movement. In Chapter 6, "Street Signs and Breadcrumbs," he outlines key navigation aids designed to answer fundamental user questions: "Where am I?" and "Where can I go from here?" These elements function like urban signage, providing constant cues without demanding attention. Persistent navigation, such as fixed headers visible on every page, ensures users always have access to primary sections like Home, Products, and Contact, preventing the need to hunt for options. Site IDs in the upper left corner reinforce branding and location, while utility links (e.g., for search or login) are grouped unobtrusively to avoid clutter. Breadcrumbs—text trails like "Home > Category > Subcategory"—are highlighted as vital for deeper pages, allowing users to trace their path and jump back levels effortlessly, particularly in hierarchical sites with more than two layers. Tabs offer another convention for categorizing content, mimicking familiar physical organizers to signal mutually exclusive options without explanation. Clear page naming further supports navigation by ensuring the browser tab or page title matches what users clicked, eliminating guesswork upon arrival. Krug stresses that subsections and local navigation must receive equal design care as top-level menus; neglecting them leads to dead ends where users feel lost. For instance, poor navigation often manifests as overly broad or ambiguous labels in cluttered horizontal menus, forcing exhaustive scanning and increasing frustration, whereas effective designs employ hierarchical dropdowns that expand only on hover, revealing logical sub-options like "Electronics > Laptops > Gaming" for precise targeting. These approaches leverage established web conventions, such as blue, underlined text for links, which users instinctively recognize and reduces cognitive load by aligning with learned expectations from years of browsing. Deviating from such patterns, like styling links as plain text, compels unnecessary thinking and slows progress. Chapter 7, "The Big Bang Theory of Web Design," positions the home page as the critical launch point—the "Big Bang" from which all user journeys emanate—requiring it to instantly clarify the site's identity, mission, and value proposition to avoid early abandonment. It must balance brevity with informativeness, featuring a prominent search box as the first element to empower direct access, alongside concise taglines that encapsulate purpose, such as a brief phrase explaining "what we do" in 6-8 words. Overloading with too many choices or irrelevant promotions overwhelms newcomers; instead, the home page should prioritize a welcome blurb, targeted content teasers, and feature highlights that guide without dictating. Amazon exemplifies this well, with its home page immediately signaling "Earth's biggest selection" through a straightforward tagline and streamlined categories, enabling users to grasp the e-commerce focus and proceed confidently within seconds. Building on users' tendency to scan rather than read, these elements ensure rapid comprehension, setting a positive trajectory for the entire site experience. Search functionality emerges as an indispensable safety net in Krug's framework, integrated prominently (especially on the home page) to rescue users when browsing paths prove inadequate, allowing keyword-based jumps to content without retracing steps. This "get out of jail free" tool compensates for imperfect navigation hierarchies, but Krug warns it should complement, not replace, intuitive structures—relying solely on search risks alienating non-expert users who prefer visual cues. Overall, these essentials prioritize familiarity and efficiency, ensuring websites feel like well-mapped territories rather than mazes.

Usability Testing and Validation

In Chapter 8 of Don't Make Me Think, Steve Krug addresses the common pitfalls of intra-team debates over usability decisions, arguing that such arguments often devolve into unproductive opinion-based standoffs that hinder progress.^[16] He advocates shifting focus to empirical user data obtained through testing, which provides objective evidence to resolve disputes without relying on subjective preferences.^[16] To foster collaboration, Krug employs the "farmer and cowman" analogy from the musical Oklahoma!, illustrating how team members with differing roles—such as designers envisioning user flows and developers prioritizing technical constraints—can achieve harmony by grounding discussions in observed user behaviors rather than personal convictions.^[16] Chapter 9 introduces Krug's practical framework for usability testing, encapsulated in the phrase "usability testing on 10 cents a day," which emphasizes affordable, frequent sessions to iteratively improve designs without requiring specialized equipment or large budgets.^[17] The core process involves recruiting 3 to 5 representative users—ordinary web users who match the target audience, compensated with a modest stipend of $50 to $100 each—to perform realistic tasks on prototypes, sketches, or live sites while observers watch without interfering.^[17] Sessions are moderated simply: define clear goals upfront, such as assessing whether users can complete key actions like finding information or making a purchase; allow participants to verbalize their thoughts aloud during tasks they partially select to ensure natural behavior; and limit interference to clarifications only, avoiding leading questions that could bias results.^[17] Following observation, the team analyzes patterns across sessions—typically lasting under an hour each—to prioritize and fix major issues before retesting, creating a low-cost cycle that costs around $300 per round when using basic recording tools like a camcorder.^[17] Krug stresses qualitative insights from these observations, such as confusion points or unexpected paths, over quantitative metrics like success rates, as the goal is to uncover usability flaws through behavior rather than prove hypotheses statistically.^[17] Common pitfalls include mistaking focus groups for testing—where opinions dominate—or delaying sessions until late in development, both of which miss opportunities for early fixes.^[17] A key tenet Krug promotes, drawing from established research, is that even imperfect testing with a small number of users reveals approximately 80% of usability problems, making it far more efficient than exhaustive studies. This rule underscores the value of starting small and iterating, as patterns in user struggles—such as navigation ambiguities—emerge quickly without needing perfect conditions.^[17]

Broader Applications

In the third edition of Don't Make Me Think, Revisited published in 2013, Steve Krug introduced a new chapter dedicated to mobile usability, recognizing the rise of smartphones like the iPhone as transformative for web design. He emphasizes designing for touch interfaces, where fingers replace mice, requiring larger tap targets—at least 44 pixels square—to accommodate imprecise touches and prevent errors. Responsive design is highlighted as essential, allowing sites to fluidly adapt layouts across screen sizes without separate mobile versions that can cause user disorientation, often described as "vertigo" when switching between desktop and mobile experiences. Krug advises avoiding hover-dependent elements, such as drop-down menus that rely on mouse-overs, since touch devices lack this interaction; instead, use persistent or tap-activated alternatives to maintain intuitiveness. Examples from the iPhone illustrate these principles, showing how its multi-touch gestures and optimized apps set standards for seamless mobile navigation.^[1] Krug extends usability principles to ethical considerations in Chapter 11, framing good design as a form of courtesy that respects users' time and dignity. He argues that minimizing frustration—through clear, non-misleading error messages that explain issues and suggest fixes—builds trust and reduces cognitive load, treating users as valued guests rather than obstacles. Privacy respect is a core tenet, with recommendations to avoid deceptive practices like hidden data collection or forced registrations, instead providing transparent policies and opt-out options to foster goodwill. This courteous approach counters common annoyances, such as intrusive pop-ups or slow-loading pages, positioning usability as a moral imperative in digital interactions.^[1] Chapter 12 addresses accessibility as an integral extension of usability, asserting that a site cannot be truly user-friendly if it excludes people with disabilities. Krug advocates compliance with Web Content Accessibility Guidelines (WCAG), a set of international standards from the World Wide Web Consortium that ensure perceivable, operable, understandable, and robust content. Practical measures include adding descriptive alt text to images for screen readers, enabling full keyboard navigation to bypass mouse requirements, and using semantic HTML tags for structure that aids assistive technologies. He stresses balancing these with overall usability, warning against overcomplicating designs—such as excessive contrast changes—that might hinder non-disabled users, and encourages testing with real assistive tools to verify inclusivity without compromising simplicity.^[1] The book's final chapter, Chapter 13, provides a pragmatic guide for implementing usability amid organizational challenges, coining the phrase "usability where you live" to advocate for practical adoption tailored to real-world constraints. Krug outlines strategies for overcoming resistance, such as educating stakeholders on usability's return on investment through quick wins like informal testing that demonstrates tangible improvements in user satisfaction. He recommends starting small—focusing on high-impact areas like navigation—rather than overhauling entire systems, and involving cross-functional teams early to build buy-in and avoid siloed efforts. By framing usability as an iterative, low-cost process integrated into daily workflows, Krug empowers designers to embed these principles sustainably within any organization.^[1] The 2013 edition incorporates updates across these areas, particularly enhancing mobile discussions with iPhone-specific examples of touch-optimized interfaces and responsive adaptations that reflect post-iPhone market shifts.^[1]

Reception and Influence

Critical Reception

Upon its release, Don't Make Me Think received widespread praise for its accessible approach to web usability, making complex concepts approachable for beginners and non-experts. The Nielsen Norman Group has highlighted the book as a key resource for understanding user experience careers, recommending it alongside other foundational texts for its practical insights into usability principles.^[18] Jakob Nielsen, a prominent usability expert, has referenced Krug's central tenet—"Don't make me think"—as a fundamental rule for usability, describing Krug as a colleague whose work complements efforts to minimize user cognitive load.^[19] Reviewers often commended its witty tone and effective use of illustrations, with outlets like SitePoint noting the engaging, conversational style that employs humor and real-world examples to simplify design concepts.^[20] The book garnered strong acclaim from major review platforms, reflecting its broad appeal. A 2001 review in Information Research described it as a "refreshingly thin" and sound introduction to web usability, emphasizing its brevity and clarity without overwhelming detail.^[21] On Goodreads, the third edition holds an average rating of 4.24 out of 5 from over 30,000 ratings, with readers frequently praising its humor, diagrams, and timeless advice on intuitive navigation.^[22] Similarly, Amazon users rate it 4.6 out of 5 based on more than 4,500 reviews, highlighting the book's entertaining illustrations and practical guidance, though some noted its examples feel dated post-2013.^[11] Critics acknowledged the book's introductory nature as both a strength and limitation, ideal for novices but lacking depth for advanced practitioners seeking rigorous methodologies. While the 2013 edition was lauded for its new chapter on mobile usability, updating core principles for smartphones and responsive design, some reviewers critiqued its brevity in addressing emerging technologies like touch interfaces and app ecosystems.^[20] Despite these points, the book has been included in "best UX books" lists by publications such as Smashing Magazine and Mopinion, recognizing its foundational role in the field.^[23] Translated into 15 languages, Don't Make Me Think has achieved global reach, with sales exceeding 700,000 copies worldwide, underscoring its popularity among designers and developers.^[1] Reader feedback consistently emphasizes its enduring relevance, even amid web evolution toward mobile and AI-driven interfaces; many describe its principles as "timeless" in Goodreads and Amazon reviews, applicable to modern user-centered design despite evolving tools.^[22]

Impact on UX Design

The book has sold over 700,000 copies worldwide, establishing it as a cornerstone text in user experience (UX) education and practice.^[1] The book is frequently incorporated into UX curricula at leading institutions, such as Stanford University's d.school resources and Carnegie Mellon University's HCI program, where it serves as an introductory guide to usability principles.^[24]^[25] Its emphasis on intuitive design has popularized the concept of "satisficing" in the UX industry, where users opt for the first acceptable option rather than the optimal one, influencing how professionals prioritize quick, low-effort interactions in digital products.^[26] The book's principles have shaped practical tools and guidelines across the field, including contributions to agile UX testing methodologies that integrate rapid usability evaluations into iterative development cycles.^[27] It has informed broader industry standards, such as elements of government usability resources like usability.gov, by advocating for clear navigation and reduced cognitive load in public-facing digital interfaces. Similarly, its focus on accessibility and adaptive design has been referenced in the evolution of web standards, aligning with the Web Content Accessibility Guidelines (WCAG) through shared goals of minimizing user effort for diverse audiences.^[28] In corporate contexts, the text's ideas resonate in frameworks like Apple's Human Interface Guidelines, which echo Krug's call for self-evident interfaces that avoid unnecessary decision-making. Culturally, the book's titular phrase "Don't make me think" has permeated design communities, inspiring memes, quotes, and discussions on platforms dedicated to UX professionals, symbolizing the push for effortless user interactions.^[29] This influence extends to global workshops led by Krug and others, where participants apply the book's testing techniques in hands-on sessions to refine prototypes and interfaces.^[30] By 2025, the principles remain relevant for emerging AI-driven interfaces, adapting to challenges like voice and search usability by emphasizing predictive, low-friction experiences that supplement rather than replace human-centered design foundations.

References

[1]
Don't Make Me Think, Revisited - Steve Krug
Here's why I wrote it: After years as a usability consultant helping my clients make their products easier to use, I knew that what I did was valuable.
[2]
Don't Make Me Think, Revisited: A Common Sense Approach to Web Usability, 3rd Edition | InformIT
**Summary of "Don't Make Me Think, Revisited: A Common Sense Approach to Web Usability, 3rd Edition":**
[3]
Don't Make Me Think: A Common Sense Approach to Web Usability ...
In this second edition, Steve adds three new chapters in the same style as the original: wry and entertaining, yet loaded with insights and practical advice.
[4]
About - Steve Krug
Steve Krug (pronounced “kroog”) is best known as the author of Don't Make Me Think: A Common Sense Approach to Web Usability, now in its third edition.
[5]
Steve Krug - Peachpit
For almost 30 years, Steve Krug was a usability consultant for a wide variety of clients like Apple, Bloomberg.com, Lexus.com, NPR, the International ...
[6]
Steve Krug | Usability, mostly.
Mar 22, 2025 · Usability/UX consultant Steve Krug (pronounced "kroog") is best known as the author of Don't Make Me Think and Rocket Surgery Made Easy.About · Rocket Surgery Made Easy · Downloads · Don't Make Me Think, RevisitedMissing: biography | Show results with:biography
[7]
Don't Make Me Think!: A Common Sense Approach to Web Usability ...
Make Me Think!: A Common Sense Approach to Web Usability, Second Edition [Book] ... 2005. Beginner. 216 pages. 4h 25m. English. New Riders · Read now. Unlock full ...
[8]
A Common Sense Approach to Web Usability, 3rd Edition - Peachpit
30-day returnsDon't Make Me Think, Revisited: A Common Sense Approach to Web Usability, 3rd Edition ... Don't make me think! Chapter 2. How we really use the ...
[9]
Don't Make Me Think, Revisited: A Common Sense Approach to ...
Steve returns with fresh perspective to reexamine the principles that made Don't Make Me Think a classic–with updated examples and a new chapter on mobile ...
[10]
Don't Make Me Think!: A Common Sense Approach to Web Usability ...
“Don't make me think!” I've been telling people for years that this is my first law of usability. And the more Web pages I look at, the more ...
[11]
Don't Make Me Think!: A Common Sense Approach to Web Usability ...
CHAPTER 2How we really use the Web. SCANNING, SATISFICING, AND MUDDLING THROUGH. Why are things always in the last place you look for them?
[12]
CHAPTER 3 Billboard Design 101 - Don't Make Me Think! - O'Reilly
Don't Make Me Think!: A Common Sense Approach to Web Usability, Second Edition · CHAPTER 3Billboard Design 101 · About O'Reilly · Support · International · Download ...
[13]
Don't Make Me Think!: A Common Sense Approach to Web Usability ...
Don't Make Me Think!: A Common Sense Approach to Web Usability, Second ... Omit needless words. Vigorous writing is concise. A sentence should contain ...
[14]
Don't Make Me Think!: A Common Sense Approach to Web Usability ...
CHAPTER 8“The Farmer and the Cowman Should Be Friends”. WHY MOST WEB DESIGN TEAM ARGUMENTS ABOUT USABILITY ARE A WASTE OF TIME, AND HOW TO AVOID THEM.
[15]
[PDF] Usability testing on 10 cents a day - Steve Krug
Sadly, this is how most usability testing gets done: too little, too late, and for all the wrong reasons. Repeat after me: Focus groups are not usability tests.
[16]
[PDF] User Experience Careers - Nielsen Norman Group
Don't Make Me Think, Revisited: A Common Sense Approach to Web Usability –. Steve Krug. Designing the User Interface: Strategies for Effective Human-Computer ...<|separator|>
[17]
UX must alleviate the cognitive burden of time
Oct 23, 2025 · My good buddy Steve Krug famously said, “Don't Make Me Think,” as his rule number one for achieving usability. While this is still a good ...
[18]
Designer Must Reads: Don't Make Me Think Revisited - SitePoint
Nov 11, 2024 · 'Don't Make Me Think' was the the UX bible before UX was a thing. Now Steve Krug has rewritten the book for the mobile generation.Missing: influence | Show results with:influence
[19]
Simplicity, usability: secrets of Web design - Information Research
The first of these is refreshingly thin! Steve Krug's Don't make me think has only 195 pages and his reasons for making a thin book are very sound: 'If it's ...
[20]
Don't Make Me Think, Revisited: A Common Sense Approach…
Rating 4.2 (30,537) Read 2041 reviews from the world's largest community for readers. Since Don't Make Me Think was first published in 2000, over 400000 Web designers and de…
[21]
5 Best User Experience (UX) Books to Cozy up with this Winter
Nov 14, 2019 · 1. Smashing UX Design · 2. Don't Make Me Think · 3. 100 Things Every Designer Needs to Know About People · 4. Lean UX · 5. The Design of Everyday ...
[22]
Don't Make Me Think, Revisited: A Common Sense Approach to ...
In stock Store nearbyDec 24, 2013 · Steve Krug (pronounced "kroog") is best known as the author of Don't Make Me Think: A Common Sense Approach to Web Usability, now in its second ...
[23]
How User Interface Design Impacts Product Development - DevSquad
Apr 7, 2023 · 4. Don't Make Me Think by Steve Krug has sold more than 600,000 copies in twenty languages. It's the go-to book on user experience and it ...
[24]
Resources | User Experience Community - Stanford University
Universal Principles of Design · Universal Methods of Design · Don't Make Me Think · A Web for Everyone: Designing Accessible User Experiences · Web Form Design.
[25]
[PDF] 2010 Senior Thesis Project Reports
May 1, 2010 · In Don't Make Me Think, Krug lays the foundation for his first law of usability stating that websites should not have elements that make ...
[26]
UX Reality Check: 14 Hard Truths About Users - Fast Company
May 17, 2016 · This is called satisficing. It's a term promoted by Steve Krug in his seminal book on web usability Don't Make Me Think. Satisficing is just ...
[27]
RITE+Krug: A Combination of Usability Test Methods for Agile Design
Don't make me think: A common sense approach to the web usability(2nd ed.). Thousand Oaks, CA, USA: New Riders Publishing. Krug, S. (2010). Rocket surgery made ...
[28]
[PDF] Accessibility, Cascading Style Sheets, and you - Steve Krug
Reprinted from Don't Make Me Think! A Common Sense Approach to Web Usability, Second Edition. Copyright 2006, Steve Krug For personal use only. Smarter adaptive.Missing: summaries | Show results with:summaries
[29]
WEEKEND READ: DIGITAL FAIRNESS MATTERS! | Richard Turrin
Oct 4, 2025 · Steve Krug wrote the UX bible Don't Make Me Think 25 years ago. I don't think even he imagined a world where we go from not thinking to not ...
[30]
Are you teaching a UX/usability course? - Steve Krug
Oct 28, 2020 · One of the things that's surprised me about Don't Make Me Think is how often it's being used in courses, ranging from high school to grad ...