introduction to
play

Introduction to eXtreme Programming (XP) Rochester Institute of - PowerPoint PPT Presentation

Oct 28, 2022 •488 likes •753 views

Introduction to eXtreme Programming (XP) Rochester Institute of Technology Software Engineering Department Extreme Programming (XP) Kent Beck C3 Project Chrysler Comprehensive Compensation system. XP Values:

  1. Introduction to eXtreme Programming (XP) Rochester Institute of Technology Software Engineering Department

  2. Extreme Programming (XP)  Kent Beck – “C3 Project” – Chrysler Comprehensive Compensation system.  XP Values: • Communication • Courage • Feedback • Simplicity • Respect (2 nd edition)  Established the Twelve Practices 2

  3. Four Project Variables  Time – duration of the project  Quality – the requirements for ‘correctness’  Resources – personnel, equipment, etc.  Scope – what is to be done; the features to be implemented  Pick three, any three . . . 3

  4. Original Twelve Practices (XP)  Metaphor  Release Planning  Testing  Pair Programming  Refactoring  Simple Design  Collective Code Ownership  Continuous Integration  On-site Customer  Small Releases  40-Hour Work Week  Coding Standards 4

  5. The Extreme Lifecycle from “Extreme Programming: a gentle introduction” http://www.extremeprogramming.org/ 5

  6. The 12 Practices of XP 1. Metaphor 2. Release Planning 3. Testing 4. Pair Programming 5. Refactoring 6. Simple Design 7. Collective Code Ownership 8. Continuous Integration 9. On-site Customer 10.Small Releases 11.40-Hour Work Week 12.Coding Standards 6

  7. Metaphor  The closest XP comes to architecture  Gives the team a consistent picture of describing the system, where new parts fit, etc.  C3 payroll . . . The paycheck goes down the assembly line and pieces of information are added.  Sometimes, you just can’t come up with one 7

  8. Release Planning  Requirements via User Stories  Short (index-card length) natural language description of what a customer wants (A commitment for further conversation)  Prioritized by customer  Resource and risk estimated by developers  Via “The Planning Game”  Highest priority, highest risk user stories included in early “time boxed” increments  Play the Planning Game after each increment 8

  9. Testing  Test-Driven Development (TDD)  Write tests before code  Tests are automated  Often use xUnit framework  Must run at 100% before proceeding  Great example of XP style TDD with Bob Martin: http://www.objectmentor.com/resources/articles/xpepisode.htm  Acceptance Tests  Written with the customer  Acts as “contract”  Measure of progress 9

  10. Pair Programming Pair-programming has been popularized by the eXtreme Programming (XP) methodology With pair-programming: • Two software engineers work on one task at one computer • One engineer, the driver, has control of the keyboard and mouse and creates the implementation • The other engineer, the navigator, watches the driver’s implementation to identify defects and participates in on-demand brainstorming • The roles of driver and observer are periodically rotated between the two software engineers 10

  11. Research Findings to Date  Strong anecdotal evidence from industry • “We can produce near defect -free code in less than half the time.”  Empirical Study • Pairs produced higher quality code – 15% more test cases passed (difference statistically significant) • Pairs completed their tasks in about half the time – 58% of elapsed time (difference not statistically significant) • Most programmers reluctantly embark on pair programming – Pairs enjoy their work more (92%) – Pairs feel more confident in their work products (96%) 11

  12. Refactor Mercilessly  Improve the design of existing code without changing functionality  Simplify code  Opportunity for abstraction  Remove duplicate code  Relies on testing to ensure nothing breaks in the process of refactoring. 12

  13. Simple Design  No Big Design Up Front (BDUF)  “Do The Simplest Thing That Could Possibly Work”  Including documentation “You Aren’t Gonna Need It” (YAGNI)  CRC cards (optional)  Technical Debt • Total amount of less-than-perfect design and implementation decisions in your project • XP takes a fanatical approach to reducing technical debt via simple design and refactoring 13

  14. Collective Code Ownership  Code to belongs to the project, not to an individual engineer  As engineers develop required functionality, they may browse into and modify any class. 14

  15. Continuous Integration  Pair writes up unit test cases and code for a task (part of a user story)  Pair unit tests code to 100%  Pair integrates  Pair runs ALL unit test cases to 100%  Pair moves on to next task with clean slate and clear mind  Should happen once or twice a day.  Prevents IntegrationHell 15

  16. On-Site Customer  Customer available on site to clarify stories and to make critical business decisions. • Product managers, domain experts, interaction designers, business analysts • Ideally 2 “customers” for every three programmers  Developers don’t make assumptions  Developers don’t have to wait for decisions  Face to face communication minimizes the chances of misunderstanding 16

  17. Small Releases  Timeboxed  As small as possible, but still delivering business value  No releases to ‘implement the database’  Get customer feedback early and often  Do the planning game after each iteration  Do they want something different?  Have their priorities changed? 17

  18. Sustainable Pace  Kent Beck says, “ . . . fresh and eager every morning, and tired and satisfied every night”  Burning the midnight oil kills performance  Tired developers make more mistakes, which slows you down more in the long run  If you mess with people’s personal lives (by taking it over), in the long run the project will pay the consequences 18

  19. Coding  Use Coding Conventions  Considering Pair Programming, Refactor Mercilessly, and Collective Code Ownership . . . need to easily find your way around (other people’s) code  Method Commenting  Priority placed on intention-revealing code  If your code needs a comment to explain it, rewrite it.  If you can't explain your code with a comment, rewrite it. 19

  20. The 13 th Practice? The Stand Up Meeting  Start day with 15-minute meeting  Everyone stands up (so the meeting stays short) in circle  Going around the room everyone says specifically:  What they did the day before  What they plan to do today  Any obstacles they are experiencing  Can be the way pairs are formed 20

  21. 2 nd Edition of XP  Practices divided into “primary” and corollary”  Primary practices • Sit together • Whole team • Information workspace • Energized work • Pair Programming • Stories • Weekly cycle • Quarterly cycle • Slack • 10 minute build • Continuous integration • Test First Programming • Incremental design 21

  22. 2 nd Edition of XP  Corollary Practices • Real customer involvement • Incremental deployment • Team continuity • Shrinking teams (frees people to form more teams) • Root-cause analysis (see next slide) • Shared code • Code and test (only permanent artifacts) • Single code base • Daily deployment • Negotiated scope contracts (time, cost, quality fixed) 22

  23. Root Cause Analysis  Every time a defect is found, eliminate the defect and its cause.  XP response to a defect: • Write an automated system-level test that demonstrates the defect. • Write a unit test that also reproduces the defect • Fix the system so that the unit test passes (should also cause system test to pass) • Once the defect is resolved, figure out why the defect was created and wasn’t caught. 23

  24. XP/Scrum Cross Reference  Collaboration • Sit together (XP) -> Open work environment (Scrum) • Whole Team -> Scrum Team • Stand-Up Meetings -> Daily Scrum • Iteration Demo -> Sprint Review  Planning • Release Planning -> Product Backlog • Iteration Planning -> Sprints • Stories -> Backlog Items  In general… • XP leans towards development practices • Scrum leans towards project management practices 24

  25. Resources • Agile Software Development Portal: agile.csc.ncsu.edu/ • Agile Alliance – www.agilealliance.com • www.extremeprogramming.org/ • Laurie Williams – North Carolina State: collaboration.csc.ncsu.edu/laurie/index.html • Extreme Programming Explained – 2 nd Edition, Kent Beck • Agile Development, James Shore & Shane Warden 25

Recommend

INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION

INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION

TRAINING COURSE ON SOCIAL PROTECTION & FORMALIZATION TRINIDAD AND TOBAGO MARCH 15, 2017 INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION Design of the NIS Assistance from the

547 views • 23 slides
INTRODUCTION Introduction 2/42 INTRODUCTION Alternations I am giving bread to the

INTRODUCTION Introduction 2/42 INTRODUCTION Alternations I am giving bread to the

Patterns of variation in the expression of case and agreement Andrs Brny Leiden University Centre for Linguistics 9 November 2019, BaSIS Workshop a.barany@hum.leidenuniv.nl INTRODUCTION Introduction 2/42 INTRODUCTION

1.37k views • 42 slides
Introduction Introduction Introduction Introduction Outline Motivation Failures

Introduction Introduction Introduction Introduction Outline Motivation Failures

Introduction Introduction Introduction Introduction Outline Motivation Failures Definition and concepts Process and product properties Principles SE Approaches Motivation Software and the economy The economies of

1.03k views • 49 slides
Introduction Introduction Introduction Nationwide Cause for Concern 1

Introduction Introduction Introduction Nationwide Cause for Concern 1

Introduction Introduction Introduction Nationwide Cause for Concern 1 https://www.cdc.gov/std/stats17/infographic.htm Introduction Epidemiology in Western Colorado CPHE Surveillance Data Report, May 2018 Chlamydia Epidemiology in Western

977 views • 39 slides
DAQ introduction Purpose of this talk : (1) Introduction for those who have not been in every

DAQ introduction Purpose of this talk : (1) Introduction for those who have not been in every

DAQ introduction Purpose of this talk : (1) Introduction for those who have not been in every meeting (2) Some ideas of diagrams for section 7.1 (Introduction) of TP. Giles Barr 25 Jan 2018, Pembroke College On DUNE, the reality is there is a

474 views • 10 slides
INTRODUCTION cf. Schneider, Chapter 1 INTRODUCTION THEY ARE OUT TO GET YOU INTRODUCTION WHAT

INTRODUCTION cf. Schneider, Chapter 1 INTRODUCTION THEY ARE OUT TO GET YOU INTRODUCTION WHAT

ADVANCED COMPUTER SECURITY INTRODUCTION cf. Schneider, Chapter 1 INTRODUCTION THEY ARE OUT TO GET YOU INTRODUCTION WHAT IS SECURITY? A systems security policies describe What the system is supposed to do Store and provide access

479 views • 16 slides
Overview Introduction to SMIL Introduction to W3C and XML Introduction to SMIL

Overview Introduction to SMIL Introduction to W3C and XML Introduction to SMIL

Overview Introduction to SMIL Introduction to W3C and XML Introduction to SMIL Writing a SMIL file Adding Media Objects Martin Halvey Clipping media files January 2008 Timing and Synchronising Layout World Wide

387 views • 14 slides
14 Introduction Introduction Bad guys can put malware into Example: hosts

14 Introduction Introduction Bad guys can put malware into Example: hosts

Introduction Introduction source Encapsulation ISO/OSI reference model message M application segment H t H t M transport network datagram H n H n H t M presentation: allow applications to frame link H l H n H t M interpret

583 views • 4 slides
Previous Lecture Introduction to SMIL 2 Introduction to W3C and XML Introduction to SMIL

Previous Lecture Introduction to SMIL 2 Introduction to W3C and XML Introduction to SMIL

Previous Lecture Introduction to SMIL 2 Introduction to W3C and XML Introduction to SMIL Writing a SMIL file Adding Media Objects Martin Halvey Clipping media files January 2008 Timing and Synchronising Layout

322 views • 8 slides
Lecture 1 Andreas Habegger Introduction Zynq Introduction Zynq Introduction Zynq PS vs. PL

Lecture 1 Andreas Habegger Introduction Zynq Introduction Zynq Introduction Zynq PS vs. PL

Introduction Zynq Lecture 1 Andreas Habegger Introduction Zynq Introduction Zynq Introduction Zynq PS vs. PL Processing System Processor Peripherals Data Buses AXI Bus Conclusion BTE5380 - Embedded Systems Octobre 2014 Andreas Habegger

1.81k views • 30 slides
2018.06 01 SMILE5 Introduction S E 5 02 Alpha Cloud M I L 03 Company Introduction 04

2018.06 01 SMILE5 Introduction S E 5 02 Alpha Cloud M I L 03 Company Introduction 04

2018.06 01 SMILE5 Introduction S E 5 02 Alpha Cloud M I L 03 Company Introduction 04 Project References S E 5 PART.1 SMILE5 Introduction M I L Introduction STORION-SMILE5 Residential Energy Storage System Inverter 5kW Output Input

1.06k views • 25 slides
Introduction to CICS Course introduction Course introduction What is CICS? What is an

Introduction to CICS Course introduction Course introduction What is CICS? What is an

Introduction to CICS Course introduction Course introduction What is CICS? What is an application server? Why use an application server? Course introduction Services provided by CICS How CICS applications are defined Scaling CICS to meet

1.84k views • 146 slides
Network Visualization Introduction Presented by Shahed Introduction Introduction Basic

Network Visualization Introduction Presented by Shahed Introduction Introduction Basic

Network Visualization Introduction Presented by Shahed Introduction Introduction Basic building blocks Node Links (relationship between nodes) Spatial information Network data

584 views • 9 slides
Introduction Introduction (1) Main argument of the paper: universities are not only

Introduction Introduction (1) Main argument of the paper: universities are not only

Le jugement des pairs comme outil de management des universits Peer-review as a management tool Christine Musselin (CSO, Sciences Po et CNRS) Avril 2013, Lirrsistible ascension du capitalisme acadmique Introduction Introduction (1)

590 views • 28 slides
Introduction Introduction to storage and to storage and filesystems filesystems Introduction

Introduction Introduction to storage and to storage and filesystems filesystems Introduction

Moreno Baricevic Gilberto Daz Axel Kohlmeyer Stefano Cozzini ULA ICTP CNR-IOM DEMOCRITOS Merida, VENEZUELA Trieste, ITALY Trieste, ITALY Introduction Introduction to storage and to storage and filesystems filesystems Introduction

1.19k views • 51 slides
JABLOTRON JA-100 introduction November 2011 Introduction Todays goals First introduction of

JABLOTRON JA-100 introduction November 2011 Introduction Todays goals First introduction of

JABLOTRON JA-100 introduction November 2011 Introduction Todays goals First introduction of the brand new JA-100 alarm system Visions Basic architecture System components Setting Help us with final validations You are the FIRST ones

1.69k views • 111 slides
1 Introduction Introduction Communication System Baseband an adjective that describes

1 Introduction Introduction Communication System Baseband an adjective that describes

Introduction Introduction Physical Layer Mobile network Global ISP Provides the means to transmit bits Basic Concepts of from sender to receiver, Data Transmission Defines the mechanical, electrical, and Home network timing

463 views • 7 slides
Welcome! Todays Agenda: Topic Introduction Course Introduction Team Practical

Welcome! Todays Agenda: Topic Introduction Course Introduction Team Practical

INFOGR Computer Graphics Jacco Bikker - April-July 2015 - Lecture 1: Introduction Welcome! Todays Agenda: Topic Introduction Course Introduction Team Practical Details Assignments Field Study State of

869 views • 62 slides
Introduction (00) RNDr. Martin Madaras, PhD. madaras@skeletex.xyz Introduction Introduction

Introduction (00) RNDr. Martin Madaras, PhD. madaras@skeletex.xyz Introduction Introduction

Virtual and Augmented Reality Introduction (00) RNDr. Martin Madaras, PhD. madaras@skeletex.xyz Introduction Introduction Who am I? What do I do here? 2 About me Short research bio: - 2014 - finished PhD at FMFI UK - 2014 2016 -

1.3k views • 39 slides
PRESENTATION The Introduction What is the Introduction ? The introduction prepares the audience

PRESENTATION The Introduction What is the Introduction ? The introduction prepares the audience

PRESENTATION The Introduction What is the Introduction ? The introduction prepares the audience for your presentation. It tells them what your presentation is about, why it is important, and finally, what to listen for in your speech. Get the

505 views • 3 slides
How to make a presentation with L A T EX? Introduction to L A T EX Introduction to Beamer

How to make a presentation with L A T EX? Introduction to L A T EX Introduction to Beamer

Introduction to Beamer Hafida Benhidour How to make a presentation with L A T EX? Introduction to L A T EX Introduction to Beamer Introduction to Beamer Hafida Benhidour Department of computer science King Saud University November

732 views • 49 slides
Shenzhen Cuilu jewelry Co., Ltd was founded in 1996 and its a large private enterprise

Shenzhen Cuilu jewelry Co., Ltd was founded in 1996 and its a large private enterprise

Introduction Introduction - - Brief Brief Introduction Introduction of of Cuilu Cuilu Group Group Introduction Introduction - - Brief Brief Introduction Introduction of of Cuilu Cuilu Group Group Shenzhen Cuilu jewelry Co., Ltd

147 views • 14 slides
Introduction to ICS- -214 214 Introduction to ICS Official Unit / Incident Log - A V-C-N.org

Introduction to ICS- -214 214 Introduction to ICS Official Unit / Incident Log - A V-C-N.org

V olunteer C ommunications N etwork (V-C-N.org) Introduction to ICS- -214 214 Introduction to ICS Official Unit / Incident Log - A V-C-N.org Academy Course - 2012-02.24-2208 262: Introduction to ICS-214 : V-C-N.org : Slide: 1 V olunteer C

735 views • 34 slides
Introduction to ICS- -214 214 Introduction to ICS Official Unit / Incident Log - A V-C-N.org

Introduction to ICS- -214 214 Introduction to ICS Official Unit / Incident Log - A V-C-N.org

V olunteer C ommunications N etwork (V-C-N.org) Introduction to ICS- -214 214 Introduction to ICS Official Unit / Incident Log - A V-C-N.org Academy Course - 2012-02.24-2208 262: Introduction to ICS-214 : V-C-N.org : Slide: 1 V olunteer C

558 views • 18 slides

More recommend