Author: Robert C. Martin
Publisher: Prentice Hall
ISBN: 013578199X
Category : Computers
Languages : en
Pages : 342
Book Description
Agile Values and Principles for a New Generation “In the journey to all things Agile, Uncle Bob has been there, done that, and has the both the t-shirt and the scars to show for it. This delightful book is part history, part personal stories, and all wisdom. If you want to understand what Agile is and how it came to be, this is the book for you.” –Grady Booch “Bob’s frustration colors every sentence of Clean Agile, but it’s a justified frustration. What is in the world of Agile development is nothing compared to what could be. This book is Bob’s perspective on what to focus on to get to that ‘what could be.’ And he’s been there, so it’s worth listening.” –Kent Beck “It’s good to read Uncle Bob’s take on Agile. Whether just beginning, or a seasoned Agilista, you would do well to read this book. I agree with almost all of it. It’s just some of the parts make me realize my own shortcomings, dammit. It made me double-check our code coverage (85.09%).” –Jon Kern Nearly twenty years after the Agile Manifesto was first presented, the legendary Robert C. Martin (“Uncle Bob”) reintroduces Agile values and principles for a new generation–programmers and nonprogrammers alike. Martin, author of Clean Code and other highly influential software development guides, was there at Agile’s founding. Now, in Clean Agile: Back to Basics, he strips away misunderstandings and distractions that over the years have made it harder to use Agile than was originally intended. Martin describes what Agile is in no uncertain terms: a small discipline that helps small teams manage small projects . . . with huge implications because every big project is comprised of many small projects. Drawing on his fifty years’ experience with projects of every conceivable type, he shows how Agile can help you bring true professionalism to software development. Get back to the basics–what Agile is, was, and should always be Understand the origins, and proper practice, of SCRUM Master essential business-facing Agile practices, from small releases and acceptance tests to whole-team communication Explore Agile team members’ relationships with each other, and with their product Rediscover indispensable Agile technical practices: TDD, refactoring, simple design, and pair programming Understand the central roles values and craftsmanship play in your Agile team’s success If you want Agile’s true benefits, there are no shortcuts: You need to do Agile right. Clean Agile: Back to Basics will show you how, whether you’re a developer, tester, manager, project manager, or customer. Register your book for convenient access to downloads, updates, and/or corrections as they become available. See inside book for details.
Clean Agile
Author: Robert C. Martin
Publisher: Prentice Hall
ISBN: 013578199X
Category : Computers
Languages : en
Pages : 342
Book Description
Agile Values and Principles for a New Generation “In the journey to all things Agile, Uncle Bob has been there, done that, and has the both the t-shirt and the scars to show for it. This delightful book is part history, part personal stories, and all wisdom. If you want to understand what Agile is and how it came to be, this is the book for you.” –Grady Booch “Bob’s frustration colors every sentence of Clean Agile, but it’s a justified frustration. What is in the world of Agile development is nothing compared to what could be. This book is Bob’s perspective on what to focus on to get to that ‘what could be.’ And he’s been there, so it’s worth listening.” –Kent Beck “It’s good to read Uncle Bob’s take on Agile. Whether just beginning, or a seasoned Agilista, you would do well to read this book. I agree with almost all of it. It’s just some of the parts make me realize my own shortcomings, dammit. It made me double-check our code coverage (85.09%).” –Jon Kern Nearly twenty years after the Agile Manifesto was first presented, the legendary Robert C. Martin (“Uncle Bob”) reintroduces Agile values and principles for a new generation–programmers and nonprogrammers alike. Martin, author of Clean Code and other highly influential software development guides, was there at Agile’s founding. Now, in Clean Agile: Back to Basics, he strips away misunderstandings and distractions that over the years have made it harder to use Agile than was originally intended. Martin describes what Agile is in no uncertain terms: a small discipline that helps small teams manage small projects . . . with huge implications because every big project is comprised of many small projects. Drawing on his fifty years’ experience with projects of every conceivable type, he shows how Agile can help you bring true professionalism to software development. Get back to the basics–what Agile is, was, and should always be Understand the origins, and proper practice, of SCRUM Master essential business-facing Agile practices, from small releases and acceptance tests to whole-team communication Explore Agile team members’ relationships with each other, and with their product Rediscover indispensable Agile technical practices: TDD, refactoring, simple design, and pair programming Understand the central roles values and craftsmanship play in your Agile team’s success If you want Agile’s true benefits, there are no shortcuts: You need to do Agile right. Clean Agile: Back to Basics will show you how, whether you’re a developer, tester, manager, project manager, or customer. Register your book for convenient access to downloads, updates, and/or corrections as they become available. See inside book for details.
Publisher: Prentice Hall
ISBN: 013578199X
Category : Computers
Languages : en
Pages : 342
Book Description
Agile Values and Principles for a New Generation “In the journey to all things Agile, Uncle Bob has been there, done that, and has the both the t-shirt and the scars to show for it. This delightful book is part history, part personal stories, and all wisdom. If you want to understand what Agile is and how it came to be, this is the book for you.” –Grady Booch “Bob’s frustration colors every sentence of Clean Agile, but it’s a justified frustration. What is in the world of Agile development is nothing compared to what could be. This book is Bob’s perspective on what to focus on to get to that ‘what could be.’ And he’s been there, so it’s worth listening.” –Kent Beck “It’s good to read Uncle Bob’s take on Agile. Whether just beginning, or a seasoned Agilista, you would do well to read this book. I agree with almost all of it. It’s just some of the parts make me realize my own shortcomings, dammit. It made me double-check our code coverage (85.09%).” –Jon Kern Nearly twenty years after the Agile Manifesto was first presented, the legendary Robert C. Martin (“Uncle Bob”) reintroduces Agile values and principles for a new generation–programmers and nonprogrammers alike. Martin, author of Clean Code and other highly influential software development guides, was there at Agile’s founding. Now, in Clean Agile: Back to Basics, he strips away misunderstandings and distractions that over the years have made it harder to use Agile than was originally intended. Martin describes what Agile is in no uncertain terms: a small discipline that helps small teams manage small projects . . . with huge implications because every big project is comprised of many small projects. Drawing on his fifty years’ experience with projects of every conceivable type, he shows how Agile can help you bring true professionalism to software development. Get back to the basics–what Agile is, was, and should always be Understand the origins, and proper practice, of SCRUM Master essential business-facing Agile practices, from small releases and acceptance tests to whole-team communication Explore Agile team members’ relationships with each other, and with their product Rediscover indispensable Agile technical practices: TDD, refactoring, simple design, and pair programming Understand the central roles values and craftsmanship play in your Agile team’s success If you want Agile’s true benefits, there are no shortcuts: You need to do Agile right. Clean Agile: Back to Basics will show you how, whether you’re a developer, tester, manager, project manager, or customer. Register your book for convenient access to downloads, updates, and/or corrections as they become available. See inside book for details.
Clean Code
Author: Robert C. Martin
Publisher: Pearson Education
ISBN: 0132350882
Category : Computers
Languages : en
Pages : 464
Book Description
This title shows the process of cleaning code. Rather than just illustrating the end result, or just the starting and ending state, the author shows how several dozen seemingly small code changes can positively impact the performance and maintainability of an application code base.
Publisher: Pearson Education
ISBN: 0132350882
Category : Computers
Languages : en
Pages : 464
Book Description
This title shows the process of cleaning code. Rather than just illustrating the end result, or just the starting and ending state, the author shows how several dozen seemingly small code changes can positively impact the performance and maintainability of an application code base.
The Clean Coder
Author: Robert C. Martin
Publisher: Pearson Education
ISBN: 0137081073
Category : Computers
Languages : en
Pages : 247
Book Description
Presents practical advice on the disciplines, techniques, tools, and practices of computer programming and how to approach software development with a sense of pride, honor, and self-respect.
Publisher: Pearson Education
ISBN: 0137081073
Category : Computers
Languages : en
Pages : 247
Book Description
Presents practical advice on the disciplines, techniques, tools, and practices of computer programming and how to approach software development with a sense of pride, honor, and self-respect.
Clean Architecture
Author: Robert C. Martin
Publisher: Prentice Hall
ISBN: 0134494326
Category : Computers
Languages : en
Pages : 652
Book Description
Practical Software Architecture Solutions from the Legendary Robert C. Martin (“Uncle Bob”) By applying universal rules of software architecture, you can dramatically improve developer productivity throughout the life of any software system. Now, building upon the success of his best-selling books Clean Code and The Clean Coder, legendary software craftsman Robert C. Martin (“Uncle Bob”) reveals those rules and helps you apply them. Martin’s Clean Architecture doesn’t merely present options. Drawing on over a half-century of experience in software environments of every imaginable type, Martin tells you what choices to make and why they are critical to your success. As you’ve come to expect from Uncle Bob, this book is packed with direct, no-nonsense solutions for the real challenges you’ll face–the ones that will make or break your projects. Learn what software architects need to achieve–and core disciplines and practices for achieving it Master essential software design principles for addressing function, component separation, and data management See how programming paradigms impose discipline by restricting what developers can do Understand what’s critically important and what’s merely a “detail” Implement optimal, high-level structures for web, database, thick-client, console, and embedded applications Define appropriate boundaries and layers, and organize components and services See why designs and architectures go wrong, and how to prevent (or fix) these failures Clean Architecture is essential reading for every current or aspiring software architect, systems analyst, system designer, and software manager–and for every programmer who must execute someone else’s designs. Register your product for convenient access to downloads, updates, and/or corrections as they become available.
Publisher: Prentice Hall
ISBN: 0134494326
Category : Computers
Languages : en
Pages : 652
Book Description
Practical Software Architecture Solutions from the Legendary Robert C. Martin (“Uncle Bob”) By applying universal rules of software architecture, you can dramatically improve developer productivity throughout the life of any software system. Now, building upon the success of his best-selling books Clean Code and The Clean Coder, legendary software craftsman Robert C. Martin (“Uncle Bob”) reveals those rules and helps you apply them. Martin’s Clean Architecture doesn’t merely present options. Drawing on over a half-century of experience in software environments of every imaginable type, Martin tells you what choices to make and why they are critical to your success. As you’ve come to expect from Uncle Bob, this book is packed with direct, no-nonsense solutions for the real challenges you’ll face–the ones that will make or break your projects. Learn what software architects need to achieve–and core disciplines and practices for achieving it Master essential software design principles for addressing function, component separation, and data management See how programming paradigms impose discipline by restricting what developers can do Understand what’s critically important and what’s merely a “detail” Implement optimal, high-level structures for web, database, thick-client, console, and embedded applications Define appropriate boundaries and layers, and organize components and services See why designs and architectures go wrong, and how to prevent (or fix) these failures Clean Architecture is essential reading for every current or aspiring software architect, systems analyst, system designer, and software manager–and for every programmer who must execute someone else’s designs. Register your product for convenient access to downloads, updates, and/or corrections as they become available.
Agile Principles, Patterns, and Practices in C#
Author: Micah Martin
Publisher: Pearson Education
ISBN: 0132797143
Category : Computers
Languages : en
Pages : 914
Book Description
With the award-winning book Agile Software Development: Principles, Patterns, and Practices, Robert C. Martin helped bring Agile principles to tens of thousands of Java and C++ programmers. Now .NET programmers have a definitive guide to agile methods with this completely updated volume from Robert C. Martin and Micah Martin, Agile Principles, Patterns, and Practices in C#. This book presents a series of case studies illustrating the fundamentals of Agile development and Agile design, and moves quickly from UML models to real C# code. The introductory chapters lay out the basics of the agile movement, while the later chapters show proven techniques in action. The book includes many source code examples that are also available for download from the authors’ Web site. Readers will come away from this book understanding Agile principles, and the fourteen practices of Extreme Programming Spiking, splitting, velocity, and planning iterations and releases Test-driven development, test-first design, and acceptance testing Refactoring with unit testing Pair programming Agile design and design smells The five types of UML diagrams and how to use them effectively Object-oriented package design and design patterns How to put all of it together for a real-world project Whether you are a C# programmer or a Visual Basic or Java programmer learning C#, a software development manager, or a business analyst, Agile Principles, Patterns, and Practices in C# is the first book you should read to understand agile software and how it applies to programming in the .NET Framework.
Publisher: Pearson Education
ISBN: 0132797143
Category : Computers
Languages : en
Pages : 914
Book Description
With the award-winning book Agile Software Development: Principles, Patterns, and Practices, Robert C. Martin helped bring Agile principles to tens of thousands of Java and C++ programmers. Now .NET programmers have a definitive guide to agile methods with this completely updated volume from Robert C. Martin and Micah Martin, Agile Principles, Patterns, and Practices in C#. This book presents a series of case studies illustrating the fundamentals of Agile development and Agile design, and moves quickly from UML models to real C# code. The introductory chapters lay out the basics of the agile movement, while the later chapters show proven techniques in action. The book includes many source code examples that are also available for download from the authors’ Web site. Readers will come away from this book understanding Agile principles, and the fourteen practices of Extreme Programming Spiking, splitting, velocity, and planning iterations and releases Test-driven development, test-first design, and acceptance testing Refactoring with unit testing Pair programming Agile design and design smells The five types of UML diagrams and how to use them effectively Object-oriented package design and design patterns How to put all of it together for a real-world project Whether you are a C# programmer or a Visual Basic or Java programmer learning C#, a software development manager, or a business analyst, Agile Principles, Patterns, and Practices in C# is the first book you should read to understand agile software and how it applies to programming in the .NET Framework.
Getting Clojure
Author: Russ Olsen
Publisher: Pragmatic Bookshelf
ISBN: 1680506099
Category : Computers
Languages : en
Pages : 407
Book Description
Behind every programming language lies a vision of how programs should be built. The vision behind Clojure is of a radically simple language framework holding together a sophisticated collection of programming features. Learning Clojure involves much more than just learning the mechanics of the language. To really get Clojure you need to understand the ideas underlying this structure of framework and features. You need this book: an accessible introduction to Clojure that focuses on the ideas behind the language as well as the practical details of writing code. Clojure attracts developers on the cutting edge and is arguably the best language for learning to program in the functional style without compromise. But this comes with a steep learning curve. Getting Clojure directly addresses this by teaching you how to think functionally as it teaches you the language. You'll learn about Clojure's powerful data structures and high-level functions, but you'll also learn what it means for a language to be functional, and how to think in Clojure's functional way. Each chapter of Getting Clojure takes a feature or two or three from the language, explains the syntax and the mechanics behind that feature so that you can make it work before digging into the deeper questions: What is the thinking behind the feature? And how does it fit in with the rest of the language? In Getting Clojure you'll learn Clojure's very simple syntax, but you'll also learn why that syntax is integral the way the language is constructed. You'll discover that most data structures in Clojure are immutable, but also why that leads to more reliable programs. And you'll see how easy it is to write Clojure functions and also how you can use those functions to build complex and capable systems. With real-world examples of how working Clojure programmers use the language, Getting Clojure will help you see the challenges of programming through the eye of experienced Clojure developers. What You Need: You will need to some background in programming. To follow along with the examples in the book, you will need Java 6 or new, Clojure 1.8 or 1.9, and Leiningen 2.
Publisher: Pragmatic Bookshelf
ISBN: 1680506099
Category : Computers
Languages : en
Pages : 407
Book Description
Behind every programming language lies a vision of how programs should be built. The vision behind Clojure is of a radically simple language framework holding together a sophisticated collection of programming features. Learning Clojure involves much more than just learning the mechanics of the language. To really get Clojure you need to understand the ideas underlying this structure of framework and features. You need this book: an accessible introduction to Clojure that focuses on the ideas behind the language as well as the practical details of writing code. Clojure attracts developers on the cutting edge and is arguably the best language for learning to program in the functional style without compromise. But this comes with a steep learning curve. Getting Clojure directly addresses this by teaching you how to think functionally as it teaches you the language. You'll learn about Clojure's powerful data structures and high-level functions, but you'll also learn what it means for a language to be functional, and how to think in Clojure's functional way. Each chapter of Getting Clojure takes a feature or two or three from the language, explains the syntax and the mechanics behind that feature so that you can make it work before digging into the deeper questions: What is the thinking behind the feature? And how does it fit in with the rest of the language? In Getting Clojure you'll learn Clojure's very simple syntax, but you'll also learn why that syntax is integral the way the language is constructed. You'll discover that most data structures in Clojure are immutable, but also why that leads to more reliable programs. And you'll see how easy it is to write Clojure functions and also how you can use those functions to build complex and capable systems. With real-world examples of how working Clojure programmers use the language, Getting Clojure will help you see the challenges of programming through the eye of experienced Clojure developers. What You Need: You will need to some background in programming. To follow along with the examples in the book, you will need Java 6 or new, Clojure 1.8 or 1.9, and Leiningen 2.
Clean Craftsmanship
Author: Robert C. Martin
Publisher: Addison-Wesley Professional
ISBN: 0136915833
Category : Computers
Languages : en
Pages : 510
Book Description
How to Write Code You're Proud of . . . Every Single Day ". . . [A] timely and humble reminder of the ever-increasing complexity of our programmatic world and how we owe it to the legacy of humankind--and to ourselves--to practice ethical development. Take your time reading Clean Craftsmanship. . . . Keep this book on your go-to bookshelf. Let this book be your old friend--your Uncle Bob, your guide--as you make your way through this world with curiosity and courage." --From the Foreword by Stacia Heimgartner Viscardi, CST & Agile Mentor In Clean Craftsmanship, the legendary Robert C. Martin ("Uncle Bob") has written the principles that define the profession--and the craft--of software development. Uncle Bob brings together the disciplines, standards, and ethics you need to deliver robust, effective code and to be proud of all the software you write. Robert Martin, the best-selling author of Clean Code, provides a pragmatic, technical, and prescriptive guide to the foundational disciplines of software craftsmanship. He discusses standards, showing how the world's expectations of developers often differ from their own and helping you bring the two in sync. Bob concludes with the ethics of the programming profession, describing the fundamental promises all developers should make to their colleagues, their users, and, above all, themselves. With Uncle Bob's insights, all programmers and their managers can consistently deliver code that builds trust instead of undermining it--trust among users and throughout societies that depend on software for their survival. Moving towards the "north star" of true software craftsmanship: the state of knowing how to program well Practical, specific guidance for applying five core disciplines: test-driven development, refactoring, simple design, collaborative programming, and acceptance tests How developers and teams can promote productivity, quality, and courage The true meaning of integrity and teamwork among programmers, and ten specific commitments every software professional should make Register your book for convenient access to the book's companion videos, updates, and/or corrections as they become available. See inside book for details.
Publisher: Addison-Wesley Professional
ISBN: 0136915833
Category : Computers
Languages : en
Pages : 510
Book Description
How to Write Code You're Proud of . . . Every Single Day ". . . [A] timely and humble reminder of the ever-increasing complexity of our programmatic world and how we owe it to the legacy of humankind--and to ourselves--to practice ethical development. Take your time reading Clean Craftsmanship. . . . Keep this book on your go-to bookshelf. Let this book be your old friend--your Uncle Bob, your guide--as you make your way through this world with curiosity and courage." --From the Foreword by Stacia Heimgartner Viscardi, CST & Agile Mentor In Clean Craftsmanship, the legendary Robert C. Martin ("Uncle Bob") has written the principles that define the profession--and the craft--of software development. Uncle Bob brings together the disciplines, standards, and ethics you need to deliver robust, effective code and to be proud of all the software you write. Robert Martin, the best-selling author of Clean Code, provides a pragmatic, technical, and prescriptive guide to the foundational disciplines of software craftsmanship. He discusses standards, showing how the world's expectations of developers often differ from their own and helping you bring the two in sync. Bob concludes with the ethics of the programming profession, describing the fundamental promises all developers should make to their colleagues, their users, and, above all, themselves. With Uncle Bob's insights, all programmers and their managers can consistently deliver code that builds trust instead of undermining it--trust among users and throughout societies that depend on software for their survival. Moving towards the "north star" of true software craftsmanship: the state of knowing how to program well Practical, specific guidance for applying five core disciplines: test-driven development, refactoring, simple design, collaborative programming, and acceptance tests How developers and teams can promote productivity, quality, and courage The true meaning of integrity and teamwork among programmers, and ten specific commitments every software professional should make Register your book for convenient access to the book's companion videos, updates, and/or corrections as they become available. See inside book for details.
A Kind of Mirraculas Paradise
Author: Sandy Allen
Publisher: Simon and Schuster
ISBN: 1501134051
Category : Biography & Autobiography
Languages : en
Pages : 288
Book Description
“Compelling…A bracing work of art and a loving tribute” (Los Angeles Times), this propulsive, stunning book illuminates the experience of living with schizophrenia like never before. Sandra Allen did not know their uncle Bob very well. As a child, Sandy had been told Bob was “crazy,” that he had spent time in mental hospitals while growing up in Berkeley in the 60s and 70s. But Bob had lived a hermetic life in a remote part of California for longer than Sandy had been alive, and what little Sandy knew of him came from rare family reunions or odd, infrequent phone calls. Then in 2009 Bob mailed Sandy his autobiography. Typewritten in all caps, a stream of error-riddled sentences more than sixty, single-spaced pages, the often-incomprehensible manuscript proclaimed to be a “true story” about being “labeled a psychotic paranoid schizophrenic,” and arrived with a plea to help him get his story out to the world. “Searing” (O, The Oprah Magazine), “enthralling” (Star-Tribune, Minneapolis), and “a marvel” (Esquire), A Kind of Mirraculas Paradise shows how Sandy translated Bob’s autobiography, artfully creating a gripping coming-of-age story while sticking faithfully to the facts as he shared them. Sandy also shares background information about their family, the culturally explosive time and place of their uncle’s formative years, and the vitally important questions surrounding schizophrenia and mental healthcare in America more broadly. The result is a heartbreaking and sometimes hilarious portrait of a young man striving for stability in his life as well as his mind, and an utterly unique lens into an experience that, to most people, remains unimaginable. “Thrilling…Gorgeous…a watershed in empathetic adaptation of ‘outsider’ autobiography” (The New Republic), A Kind of Mirraculas Paradise is a dazzlingly, daringly written book that’s poised to change conversations about schizophrenia and mental illness overall.
Publisher: Simon and Schuster
ISBN: 1501134051
Category : Biography & Autobiography
Languages : en
Pages : 288
Book Description
“Compelling…A bracing work of art and a loving tribute” (Los Angeles Times), this propulsive, stunning book illuminates the experience of living with schizophrenia like never before. Sandra Allen did not know their uncle Bob very well. As a child, Sandy had been told Bob was “crazy,” that he had spent time in mental hospitals while growing up in Berkeley in the 60s and 70s. But Bob had lived a hermetic life in a remote part of California for longer than Sandy had been alive, and what little Sandy knew of him came from rare family reunions or odd, infrequent phone calls. Then in 2009 Bob mailed Sandy his autobiography. Typewritten in all caps, a stream of error-riddled sentences more than sixty, single-spaced pages, the often-incomprehensible manuscript proclaimed to be a “true story” about being “labeled a psychotic paranoid schizophrenic,” and arrived with a plea to help him get his story out to the world. “Searing” (O, The Oprah Magazine), “enthralling” (Star-Tribune, Minneapolis), and “a marvel” (Esquire), A Kind of Mirraculas Paradise shows how Sandy translated Bob’s autobiography, artfully creating a gripping coming-of-age story while sticking faithfully to the facts as he shared them. Sandy also shares background information about their family, the culturally explosive time and place of their uncle’s formative years, and the vitally important questions surrounding schizophrenia and mental healthcare in America more broadly. The result is a heartbreaking and sometimes hilarious portrait of a young man striving for stability in his life as well as his mind, and an utterly unique lens into an experience that, to most people, remains unimaginable. “Thrilling…Gorgeous…a watershed in empathetic adaptation of ‘outsider’ autobiography” (The New Republic), A Kind of Mirraculas Paradise is a dazzlingly, daringly written book that’s poised to change conversations about schizophrenia and mental illness overall.
Uncle Bob
Author: Brad Gosse
Publisher: Independently Published
ISBN:
Category :
Languages : en
Pages : 26
Book Description
Uncle Bob showed up at school unannounced. You were swimming and the teacher pulled you out. Now you're driving somewhere and your uncle won't shut up about his knob.
Publisher: Independently Published
ISBN:
Category :
Languages : en
Pages : 26
Book Description
Uncle Bob showed up at school unannounced. You were swimming and the teacher pulled you out. Now you're driving somewhere and your uncle won't shut up about his knob.
When Uncle Bob Died
Author: Althea
Publisher:
ISBN: 9781903285091
Category : Bereavement
Languages : en
Pages : 32
Book Description
Uses a story format to introduce death and bereavement. Explains how death is a natural part of life, including why people die, how people express grief in different ways. Suggested level: junior, primary.
Publisher:
ISBN: 9781903285091
Category : Bereavement
Languages : en
Pages : 32
Book Description
Uses a story format to introduce death and bereavement. Explains how death is a natural part of life, including why people die, how people express grief in different ways. Suggested level: junior, primary.