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Radu Poenaru Ijaz Ahmet
History of Agile Quick introduction into the History of Agile development, as we see it after almost few decades from its inception. Radu Poenaru Ijaz Ahmet
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Intro Basic ideas of the Agile technique:
Recalibrate itself Adaptive result Customer gets quick updates ... And gives quick feedback Thus the programmer‘s work is useful to the cliend and both time is used to the maximum
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Roots Around 1950 the methodology was created - Toyota factory was the first adopting Build products only for which you have a customer Eliminate anything that doesn‘t add value Stop if something goes wrong
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Toyota‘s values A real philosophy of work, which:
respects those engaged in the work strives for full utilization of workers’ capabilities places authority and responsibility for the work with those doing it
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Hardware vs Software Applying Toyota techniques to software industry is not so easy nor efficient While a steel plate can‘t be recomposed after cutting, a piece of code can be easily cut and pasted The workers can‘t specialise enough in one direction (eg design) without loosing the big picture Fast and addapted techniques were developed - „Time is money“
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Planning VS Agile Waterfall model: eXtreme Programming Reusability
Predictive model Optimized for a single purpose Hard to change eXtreme Programming Reusability Easy to change direction But no idea of next 6 months
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Agile technique Sprints – reccuring periods in which code is created
User gets the build and starts reviewing it Feedback from user to the team Thus, team is kept on the right path
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Methodology … is a family of development processes
Individuals and interactions over processes and tools Working software over comprehensive documentation Customer collaboration over contract negotiation Responding to change over following a plan
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SCRUM one of Agile processes
use incremental framework for developing complex software managing new products considered more like a framework in which you can employ various processes and techniques Key principle: during a project the customers can change their minds
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Managing complex products
Transparency The outcome of the product should be visible to the manager who is managing the outcomes. Also each process that affect the outcome of the product also should been visible to the managers. Inspection Various aspects of the process must be frequently inspected regularly so that quality of work and peoples can be seen. Adaptation If the inspection process find outs some process are outside the scope of the product or the outcomes will be unacceptable, then the inspector should response quickly and adjusts the process or data being used in the process.
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Partners Product Owner (Also known as chickens) Scrum Master
is responsible for the communicating version of the product. Scrum Master Scrum manager provide cooperation between the product owner and team. Team (Also known as pigs) It’s the team which performs work or sprint- usually there are many teams working on their sprints and each team consist of 5 to 9 cross- functional members. 1. Product Owner - is responsible for the communicating version of the product (Also known as chickens). In a sprint the feature sets comes from product backlog. Product backlog is list of prioritized requirements. This list is managed by Product owner. They communicate with the development team for the outcome of sprint. The product owner is often someone from product management or marketing, a key stakeholder or a key user. 2. Scrum Master Scrum manager provide cooperation between the product owner and team. Scrum Master also responsible for making sure that the team is as productive as possible but don’t manage teams. The Scrum Master does this by helping the team use the Scrum process, by removing impediments to progress that are obstructing the team from achieving its sprint goals. This role helps the Team while making its outcome visible to Product Owner. 3. Team It’s the team which performs work or sprint. In Scrum there are many teams working on their sprints and each team consist of 5 to 9 cross-functional members. This team is mixture of peoples from different departments to work as a team to complete the sprint. The team determines how much of sprint they can commit to complete during the next sprint. After sprint is completed, the team demonstrates the use of the software.
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SCRUM terms The Sprint The Backlog The Sprint Backlog
Sprint is one iteration. Project is dived into small workable sprints which take 2 to 4 week durations, no change to the sprint backlog The Backlog list of requirement from product owner based on their priorities - after every sprint, backlogs are updated. The Sprint Backlog the information how this sprint going to be implemented- process/features are broken down in to small tasks (6 to 8 hours) for teams.
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SCRUM terms (2) The Time Boxing The Daily Meeting/Scrum
Everything in scrum is time-boxed - It’s about release planning meeting, sprint planning meeting, sprint review and daily scrum meetings. The Daily Meeting/Scrum also called as "the daily standup“ - 15 minutes and all peoples are welcome to join but only the teams (pigs) are allowed to speak. This meeting has only 3 questions to answer What you done yesterday? What you will do today? Do you have issues which are stopping you doing this job?
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Coverage first applied to software development
but then successfully used in big industries now it used for developing any kind of product. the best part of SCRUM as compared to other agile process that it introduces the idea of real world progress of a project not just the best guess on unknown information.
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eXtreme Programming is about project management, practices and programming methodologies for rapidly developing high quality software for the customer in fastest way possible
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eXtreme Programming(2)
whole process is visible and accountable developers program in pairs show concrete progress in the form of deployable software development includes extensive code review unit testing of all the code
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XP - activities Coding Testing Listening Designing
First test, then code Code integrated often to avoid changes in main product later Testing The process that says when development is done Ensures that software meets client requirements Listening Customer is participating in all stages Clarify and sharpens the team‘s perception on requirements Designing Reduces the code complexity by analysis Ensures that all pieces of code are efficiently tied together
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XP - values Communication Simplicity Feedback Courage Humility/Respect
documentation is not a core value or at least a very little – the communication increases cooperation, group productiveness, and decreases mistakes Simplicity implement the simplest solution or write code which you believe will be rewrite for extra functionality. Feedback Kent : "Optimism is an occupational hazard of programming, feedback is the treatment." -feedback keeps the project on track. Courage make decisions and assume their responsibility - change direction by either discarding or re-factoring your work. Humility/Respect The best developers have the humility to recognize that they do not know everything, that their fellow developers also have their own areas of expertise.
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eXtreme Programming Core practices of XP
Pair Programming: All code is written by 2 programmers Planning Game: Stories from Business and development cooperate Small Releases: There is a short time between versions Continuous Testing: Before you write a program for features, you write a test for it
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eXtreme Programming Core practices of XP
Simple Design: Always use the simplest possible design that gets the job done Re-factoring: You cannot leave the duplicated code around. Collective Code Ownership: No single person "owns" a module. Continuous Integration: Code addition and changes are integrated into the codebase after few hours or at least daily.
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eXtreme Programming Core practices of XP
Coding Standards: Everyone codes to the same standards. Forty Hour Week: Programmers go home on time and enjoy weeks too. On-site Customer: The customer should be available for answering questions any time for developers.
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Comparison of techniques
XP is more toward rapid programming, scrum is more of team work and Toyota production system is organized manufacturing and logistics for the manufacturer. XP consists of five values and 12 common practices. Scrum development process is divided into 2-4 weeks sprints
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Comparison of techniques
scrum allows to start development even if you are uncertain about what the clients wants. Toyota production system does not have power to stand against issues instead it stop.
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Comparison of techniques
Scrum allows to combine it with XP to make good combination of speed programming.
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Conclusion Decision of technique is depends on situation.
Scrum is independent of software development while XP is for speed programming TPS reduces the element of waste and overburden. Each process has its own benefits and can be combined in best situations.
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Thank You!!!
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