Agile
Agile Development, Wireframes, and User Stories
Objectives
Explain the basics of Agile methods and why it's used
Describe user stories and how they are different than to-dos
Practice creating user stories for an example app
Agile Development, Wireframes, and User Stories
Agile and Waterfall
Waterfall
The waterfall model is a sequential design process, used in software development processes, in which progress is seen as flowing steadily downwards (like a waterfall) through the phases of Conception, Initiation, Analysis, Design, Construction, Testing, Production/Implementation and Maintenance.- Wikipedia
Waterfall is a good example of a linear methodology. It has it's own benefits:
simple, easy to understand and use.
easy to manage due to the rigidity of the model -- each phase has specific deliverables and a review process
phases are processed, completed one at a time, and do not overlap
works well for smaller projects where requirements are very well understood
However, other methodologies have evolved as the need for greater flexibility has arisen.
Agile
Agile software development is a group of software development methods in which requirements and solutions evolve through collaboration between self-organizing, cross-functional teams. It promotes adaptive planning, evolutionary development, early delivery, continuous improvement, and encourages rapid and flexible response to change- Wikipedia
The Agile Manifesto
This was a formal "proclamation" of key values and principles for approaching software development that was put together in 2001. The four key concepts value:
Individuals and interactions over processes and tools: self-organization and motivation are important, as are interactions like co-location and pair programming
Working software over comprehensive documentation: working software is more useful and welcome than just presenting documents to clients in meetings
Customer collaboration over contract negotiation: requirements cannot be fully collected at the beginning of the software development cycle, therefore continuous customer or stakeholder involvement is very important
Responding to change over following a plan: agile methods are focused on quick responses to change and continuous development
However, keep in mind that not all of these values are beneficial for all projects. For example, freelancers will usually want a set plan and contract in place in order to prevent scope creep.
The core principles of agile development remain the same:
Iterative, incremental and evolutionary
Efficient and face-to-face communication
Very short feedback loop and adaptation cycle
Quality focus
Adaptive over predictive
Iterative over waterfall
Code over documentation
Agile practices
Agile development is supported by a bundle of concrete practices suggested by the agile methods, covering areas like requirements, design, modeling, coding, testing, project management, process, quality, etc. Some notable agile practices include - Wiki
Agile practices
Test-driven development (TDD) is a software development process that relies on the repetition of a very short development cycle: first the developer writes an (initially failing) automated test case that defines a desired improvement or new function, then produces the minimum amount of code to pass that test, and finally refactors the new code to acceptable standards.
Continuous integration (CI) is the practice of merging all developer working copies with a shared mainline several times a day. It was adopted as part of extreme programming (XP), which did advocate integrating more than once per day, perhaps as many as tens of times per day. The main aim of CI is to prevent integration problems, referred to as "integration hell" in early descriptions of XP. CI isn't universally accepted as an improvement over frequent integration, so it is important to distinguish between the two as there is disagreement about the virtues of each. During WDI we will look at Travis CI as an example of Continuous Integration.
Information radiators is a generic term for any handwritten, drawn, printed or electronic displays that a team places in a highly visible location to track progress or metrics. Examples include scrum board, task board, or a burndown chart.
Pair programming (sometimes referred to as peer programming) is an agile software development technique in which two programmers work as a pair together on one workstation. One, the driver, writes code while the other, the observer, pointer or navigator, reviews each line of code as it is typed in. The two programmers switch roles frequently.
Refactoring is the process of restructuring existing computer code -- changing the factoring -- without changing its external behavior. Refactoring improves nonfunctional attributes of the software.
Scrum meetings are short meetings used to plan, review, and increase accountability and clarity across a team. Examples include sprint planning, daily scrum, sprint review and retrospective, and STAND UPS.
User personas are used in user-centered design and marketing. They can be described as fictional characters created to represent the different user types that might use a site, brand, or product in a similar way. Marketers may use personas together with market segmentation, where the qualitative personas are constructed to be representative of specific segments.
User story is a description consisting of one or more sentences in the everyday or business language of the end user or user of a system that captures what a user does or needs to do as part of his or her job function. User stories are used with agile software development methodologies as the basis for defining the functions a business system must provide, and to facilitate requirements management. It captures the 'who', 'what' and 'why' of a requirement in a simple, concise way, often limited in detail by what can be hand-written on a small paper notecard.
Wireframes A website wireframe, also known as a page schematic or screen blueprint, is a visual guide that represents the skeletal framework of a website.
Wireframes
A website wireframe, also known as a page schematic or screen blueprint, is a visual guide that represents the skeletal framework of a website. - Wikipedia
[...continued...] Wireframes are created for the purpose of arranging elements to best accomplish a particular purpose. The purpose is usually being informed by a business objective and a creative idea. The wireframe depicts the page layout or arrangement of the website's content, including interface elements and navigational systems, and how they work together. The wireframe usually lacks typographic style, color, or graphics, since the main focus lies in functionality, behavior, and priority of content.
The key points to get across when creating a wireframe are:
Information design
Navigation design
Interface design
An example of a wireframe
Let's look at the difference between YouTube's page for a particular video and how a wireframe compares:
Wireframes focus on:
The range of functions available
The relative priorities of the information and functions
The rules for displaying certain kinds of information
The effect of different scenarios on the display
Useful wireframing tools
Writing utensils (markers, pens, pencils)
User Stories
Once you have constructed User Personas, to better understand your Users, you must construct User stories to identify each pathway they may want to take through your app or website.
User stories exist in different formats, but this is one that works quite well:
As a [role], I want to [goal] so I can [benefit/purpose]
For example:
As a user, I want to read reviews of a selected book to help me decide whether to buy **
As an admin, I want to update the inventory of a selected book so my users know what is available.**
Conclusion
Describe agile development.
Compare agile development to waterfall development.
What are users stories and why are they used?
What are wireframes and why are they used?
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