What is Scrum?
Scrum is an iterative and incremental agile software
development method for managing software projects and product or application
development.
What is the difference between agile and scrum development?
Agile and Scrum are terms used in project management. The
Agile methodology employs incremental and iterative work beat that are also
called sprints. Scrum, on the other hand is the type of agile approach that is
used in software development.Agile itself is not a specific way of working, it
is generic set of principles or priorities which are outlined in the Agile
Manifesto. Scrum is a specific flavor of Agile, specifically it is referred to
as an agile project management framework. It draws on the principles of the
Agile Manifesto but goes into detail to define day-to-day activities and how to
manage a project in a specific way.
What are the advantages of Scrum?
The sprint process allows for "good enough"
development that results in a saleable product even while the project is in
full swing. This incremental delivery system shortens the time to market and
may result in higher revenue, as each completed backlog represents a new
release of the product. In addition, reviewing each sprint before moving to the
next means that testing is conducted throughout the process, which allows teams
to change the scope or direction of the project at any point. Although the
deadline and budget are fixed variables, the project requirements are not. In
fact, stakeholders and participants anticipate changes along the way. The
product owner's involvement in the project management process facilitates these
changes.
Well, Scrum enables Agility. Three key benefits of Scrum
adoption for you are ability to
Respond to changes, while minimizing risk
Increase ROI (return on investment)
Continuously improve
What are the dis-advantages of Scrum?
It can be difficult for the Scrum master to plan, structure
and organize a project that lacks a clear definition. In addition, frequent
changes, frequent product delivery and uncertainty regarding the precise nature
of the finished product make for a rather intense project life cycle for
everyone involved. Furthermore, the daily Scrum meetings and frequent reviews
require substantial resources. A successful project depends on the maturity and
dedication of all participants, and their ability to maintain consistently high
levels of communication through each backlog and review.
What is the difference between Scrum and Extreme
Programming?
There are major four differences between Scrum and Extreme
Programming:
Scrum teams typically work in iterations (called sprints)
that are from two weeks to one month long. XP teams typically work in
iterations that are one or two weeks long.
Scrum teams do not allow changes into their sprints. Once
the sprint planning meeting is completed and a commitment made to delivering a
set of product backlog items, that set of items remains unchanged through the
end of the sprint. XP teams are much more amenable to change within their
iterations. As long as the team hasn�t started work on a particular feature,
a new feature of equivalent size can be swapped into the XP team�s iteration
in exchange for the unstarted feature.
Extreme Programming teams work in a strict priority order.
Features to be developed are prioritized by the customer (Scrum�s Product
Owner) and the team is required to work on them in that order. By contrast, the
Scrum product owner prioritizes the product backlog but the team determines the
sequence in which they will develop the backlog items. I�ve never seen a
Scrum team not choose to work on the highest-priority item. And a Scrum team
will very likely choose to work on the second most important. However, at some
point one of the high priority items may not be a good fit for the sprint being
planned�maybe a key person who should work on it will be swamped by work on
higher priority items. Or maybe it makes sense to work on a slightly lower
priority item (let�s say #10 on the product backlog instead of #6) because
the team will be working in the code where #10 would be implemented.
Scrum doesn�t prescribe any engineering practices; XP
does. I love the XP engineering practices, particularly things like test-driven
development, the focus on automated testing, pair programming, simple design,
refactoring, and so on. However, I think it�s a mistake to say to the team
�you�re self-organizing, we trust you, but you must do these specific
engineering practices�.� This sends a mixed message to the team that causes
confusion. I love the XP practices but don�t like mandating them. I want
teams to discover the value on their own.
What is a Sprint?
A sprint is the basic unit of development in Scrum. Sprints
last between one week and one month, and are a "timeboxed" (i.e.
restricted to a specific duration) effort of a constant length. Each sprint is
preceded by a planning meeting, where the tasks for the sprint are identified
and an estimated commitment for the sprint goal is made, and followed by a review
or retrospective meeting, where the progress is reviewed and lessons for the
next sprint are identified.
What are types of roles in scrum?
Scrum teams consist of two types of roles:
Main / Core Roles
Ancillary Roles
Main / Core roles are often referred to as pigs and
ancillary roles as chickens (after the story "The Chicken and the
Pig"
What are main / core roles in Scrum?
The three main / core roles in Scrum are:
Scrum Master: Who ensures the process is followed, removes
impediments, and protects the Development Team from disruption
Product Owner: Who represents the stakeholders and the
business
Development Team: A cross-functional, self-organizing team
who do the actual analysis, design, implementation, testing, etc.
What are Ancillary roles?
The ancillary roles in Scrum teams are those with no formal
role and infrequent involvement in the Scrum process�but nonetheless, they
must be taken into account.
Stakeholders (customers, vendors):
These are the people who enable the project and for whom the
project produces the agreed-upon benefit[s] that justify its production. They
are only directly involved in the process during the sprint reviews.
Managers
People who control the environment.
What are the types of meetings in scrum?
There 6 types of meetings in scrum:
Daily Scrum / Standup
Backlog grooming: storytime
Scrum of Scrums
Sprint planning meeting
Sprint review meeting
Sprint retrospective
What is Daily Scrum / Standup?
Each day during the sprint, a project status meeting occurs.
This is called a daily scrum, or the daily standup.
What are 3 questions in Daily Scrum / Standup?
The three questions in Daily Scrum / Standup are:
What have you done since yesterday?
What are you planning to do today?
Any impediments/stumbling blocks?
What is Backlog grooming / storytime?
The team should spend time during a sprint doing backlog
grooming. This is the process of: estimating the existing backlog using
effort/points, refining the acceptance criteria for individual stories, and
breaking larger stories into smaller stories.
What is Scrum of Scrums?
It is a meeting each day normally after the Daily Scrum.
These meetings allow clusters of teams to discuss their
work, focusing especially on areas of overlap and integration.
A designated person from each team attends.
The agenda will be the same as the Daily Scrum, plus the
following four questions:
What has your team done since we last met?
What will your team do before we meet again?
Is anything slowing your team down or getting in their way?
Are you about to put something in another team�s way?
What is Sprint planning meeting?
At the beginning of the sprint cycle (every 7�30 days), a
�Sprint planning meeting� is held.
Select what work is to be done
Prepare the Sprint Backlog that details the time it will
take to do that work, with the entire team
Identify and communicate how much of the work is likely to
be done during the current sprint
Eight-hour time limit
(1st four hours) Product Owner + Team: dialog for
prioritizing the Product Backlog
(2nd four hours) Team only: hashing out a plan for the
Sprint, resulting in the Sprint Backlog
What is Sprint review meeting?
At the end of a sprint cycle, the �Sprint Review
Meeting� is held.
Review the work that was completed and not completed
Present the completed work to the stakeholders (a.k.a.
�the demo�)
Incomplete work cannot be demonstrated
Four-hour time limit
What is Sprint retrospective?
At the end of a sprint cycle, two meetings are held: the
�Sprint Retrospective� is held.
All team members reflect on the past sprint
Make continuous process improvements
Two main questions are asked in the sprint retrospective:
What went well during the sprint? What could be improved in the next sprint?
Three-hour time limit
What is Product Backlog?
The product backlog is an ordered list of
"requirements" that is maintained for a product. It contains Product
Backlog Items that are ordered by the Product Owner based on considerations
like risk, business value, dependencies, date needed, etc. The features added
to the backlog are commonly written in story format. The product backlog is the
�What� that will be built, sorted in the relative order it should be built
in. It is open and editable by anyone, but the Product Owner is ultimately
responsible for ordering the stories on the backlog for the Development Team.
The product backlog contains rough estimates of both business value and
development effort, these values are often stated in story points using a
rounded Fibonacci sequence. Those estimates help the Product Owner to gauge the
timeline and may influence ordering of backlog items. For example, if the
�add spellcheck� and �add table support� features have the same
business value, the one with the smallest development effort will probably have
higher priority, because the ROI (Return on Investment) is higher.
The Product Backlog, and business value of each listed item
is the responsibility of the Product Owner. The estimated effort to complete
each backlog item is, however, determined by the Development Team.
What is Sprint Backlog?
The sprint backlog is the list of work the Development Team
must address during the next sprint. The list is derived by selecting
stories/features from the top of the product backlog until the Development Team
feels it has enough work to fill the sprint. This is done by the Development
Team asking "Can we also do this?" and adding stories/features to the
sprint backlog. The Development Team should keep in mind the velocity of its
previous Sprints (total story points completed from each of the last sprints
stories) when selecting stories/features for the new sprint, and use this
number as a guide line of how much "effort" they can complete.
The stories/features are broken down into tasks by the
Development Team, which, as a best practice, should normally be between four
and sixteen hours of work. With this level of detail the Development Team
understands exactly what to do, and potentially, anyone can pick a task from
the list. Tasks on the sprint backlog are never assigned; rather, tasks are
signed up for by the team members as needed during the daily scrum, according
to the set priority and the Development Team member skills. This promotes
self-organization of the Development Team, and developer buy-in.
The sprint backlog is the property of the Development Team,
and all included estimates are provided by the Development Team. Often an
accompanying task board is used to see and change the state of the tasks of the
current sprint, like �to do�, �in progress� and �done�.
What is Increment?
The increment is the sum of all the Product Backlog Items
completed during a sprint and all previous sprints. At the end of a sprint, the
Increment must be done according to the Scrum Team's definition of done. The
increment must be in useable condition regardless of whether the Product Owner
decides to actually release it.
What is Burn down?
The sprint burn down chart is a publicly displayed chart
showing remaining work in the sprint backlog. Updated every day, it gives a
simple view of the sprint progress. It also provides quick visualizations for
reference. There are also other types of burndown, for example the release
burndown chart that shows the amount of work left to complete the target
commitment for a Product Release (normally spanning through multiple
iterations) and the alternative release burndown chart,[16] which basically
does the same, but clearly shows scope changes to Release Content, by resetting
the baseline.
What is User Story?
A feature that is added to the backlog is commonly referred
to as a story and has a specific suggested structure. The structure of a story
is: "As a I want to so that " This is done so that the development
team can identify the user, action and required result in a request and is a
simple way of writing requests that anyone can understand. Example: As a wiki
user I want a tools menu on the edit screen so that I can easily apply font
formatting.
A story is an independent, negotiable, valuable,
estimatable, small, testable requirement ("INVEST Acronym"). Despite
being independent i.e. they have no direct dependencies with other
requirements, stories may be clustered into epics when represented on a product
roadmap or further down in the backlog.
What is Theme?
A theme is a top-level objective that may span projects and
products. Themes may be broken down into sub-themes, which are more likely to
be product-specific. Themes can be used at both program and project level to
drive strategic alignment and communicate a clear direction.
What is Epic?
An epic is a group of related stories, mainly used in
product roadmaps and the backlog for features that have not yet been analyzed
enough to break it down into it's component stories, which should be done
before bringing it into a sprint so to reduce uncertainty. Epics can also be
used at a both program and project level.
What is Spike?
A time boxed period used to research a concept and/or create
a simple prototype. Spikes can either be planned to take place in between
sprints or, for larger teams, a spike might be accepted as one of many sprint
delivery objectives. Spikes are often introduced before the delivery of large
epics or user stories in order to secure budget, expand knowledge, and/or
produce a proof of concept. The duration and objective(s) of a spike will be
agreed between the Product Owner and Delivery Team before the start. Unlike
sprint commitments, spikes may or may not deliver tangible, shippable, valuable
functionality. For example, the objective of a spike might be to successfully
reach a decision on a course of action. The spike is over when the time is up,
not necessarily when the objective has been delivered.
What is Tracer Bullet?
The tracer bullet is a spike with the current architecture,
current technology set, current set of best practices which results in
production quality code. It might just be a very narrow implementation of the
functionality but is not throw away code. It is of production quality and rest
of the iterations can build on this code.
What is Point Scale/Effort/Story points?
Relates to an abstract point system, used to discuss the
difficulty of the story, without assigning actual hours. The most common scale
used is a rounded Fibonacci sequence (1,2,3,5,8,13,20,40,100), although some
teams use linear scale (1,2,3,4...), Powers-of-2 (1,2,4,8...), and Clothes size
(XS, S, M, L, XL).
What are Tasks?
Added to the story at the beginning of a sprint and broken
down into hours. Each task should not exceed 12 hours, but it's common for
teams to insist that a task take no more than a day to finish.
What is Definition of Done (DoD)?
The exit-criteria to determine whether a product backlog
item is complete. In many cases the DoD requires that all regression tests
should be successful.
What is Velocity?
The total effort a team is capable of in a sprint. The
number is derived by adding all the story points from the last sprint's
stories/features. This is a guideline for the team and assists them in
understanding how many stories they can do in a sprint.
What is Impediment?
Anything that prevents a team member from performing work as
efficiently as possible.
What is Sashimi?
A report that something is "done". The definition
of "done" may vary from one Scrum team to another, but must be
consistent within one team.
What is Abnormal Termination?
The Product Owner can cancel a Sprint if necessary. The
Product Owner may do so with input from the team, scrum master or management.
For instance, management may wish to cancel a sprint if external circumstances
negate the value of the sprint goal. If a sprint is abnormally terminated, the
next step is to conduct a new Sprint planning meeting, where the reason for the
termination is reviewed.
What is Planning Poker?
In the Sprint Planning Meeting, the team sits down to
estimate its effort for the stories in the backlog. The Product Owner needs
these estimates, so that he or she is empowered to effectively prioritize items
in the backlog and, as a result, forecast releases based on the team's
velocity.
What is Scrum-ban?
Scrum-ban is a software production model based on Scrum and
Kanban. Scrum-ban is especially suited for maintenance projects or (system)
projects with frequent and unexpected user stories or programming errors. In
such cases the time-limited sprints of the Scrum model are of no appreciable use,
but Scrum�s daily meetings and other practices can be applied, depending on
the team and the situation at hand. Visualization of the work stages and
limitations for simultaneous unfinished user stories and defects are familiar
from the Kanban model. Using these methods, the team�s workflow is directed
in a way that allows for minimum completion time for each user story or
programming error, and on the other hand ensures each team member is constantly
employed.
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