Introduction to Agile Requirements, Estimation

Introduction to Agile Software Requirements

Abhilash ChandranDevelopment Manager

Xerox

What are we going to discuss today?

• What stories are• Writing User Story• Estimation• Workshop

Books …

Product Vision

• What the product should look like when ultimately finished– Type of features supported– Type of users– Market share etc.

• Continuous change because of – New knowledge– New customer base– New or changing market conditions

Product Vision…

• Should contain– Product features (as would be listed on the

product box or web site)– Target market/customers– Key differentiators

Cone of uncertainty

Continuous iterations

• Traveling at night• Embrace the change• Write only what you have• Do only what you know• Add new insights

User Roles

• A user role is any type of user that interacts with the system

• Identifying the different types of Users is the first step in Agile Product Management

• Lack of a clear understanding of User Roles – critical requirements can be missed or

misunderstood– Higher probability of developing a wrong software

with unwanted features .

User story

• A sentence or a paragraph that describes functionality of the system from the user’s perspective

As a <type of user>I can <perform some task>[so that I can <achieve some goal>]

User Story…

• As a user,I want to reserve a hotel room

• As a frequent flyer,I want to rebook a past trip so that I save time booking trips I take often.

3 C’s

• Card: The written description of the story• Conversation: Verbal discussions that bring

out further details of the system• Confirmation: the conditions of satisfaction

that are used to determine when the feature is complete– Should also include key conditions or constraints

Conversation

• As a user, I can cancel a reservation.– Does the user get a full or partial refund?– Is the refund to her credit card or is it site credit?– How far ahead must the reservation be cancelled?– Is that the same for all hotels?– For all site visitors? Can frequent travellers cancel

later?– Is a confirmation provided to the user?– How?

Conditions of satisfaction

• As a user, I can cancel a reservation.– Verify that a premium member can cancel the

same day without a fee.– Verify that a non-premium member is charged

10% for a same-day cancellation.– Verify that an email confirmation is sent.– Verify that the hotel is notified of any cancellation

Split Stories

• As a user, I can cancel a reservation.– As a premium site member,

I can cancel a reservation up to the last minute.– As a site visitor, I am emailed a confirmation of

any cancelled reservation.

Epic

• A very large user story

• As a user, I can cancel a reservation.

Start with Epic

• MMF – Minimum Marketable Feature• A basic set of features required for product

which can be marketed

Estimation

• Planning Poker– It is about size not duration– Identify the relative value

Activity

• User story breakdown• Estimation

Part II

• Workshop on Clean code

Book…

Test Driven Development

Demo

• Demo with C# and MS Unit Test

Demo

• Demo with C# & Specflow

Behaviour-driven development

SOLID Principles

• Stands for five basic principles of object-oriented programming and design

• Are guidelines that can be applied while working on software to improve code quality

• Helps in – low coupling, – high cohesion – strong encapsulation

SRP

• Single responsibility principleA class should have only a single responsibility (i.e. only one potential change in the software's specification should be able to affect the specification of the class)

OCP

• Open/closed principleSoftware entities … should be open for extension, but closed for modification

LSP

• Liskov substitution principleObjects in a program should be replaceable with instances of their subtypes without altering the correctness of that program

ISP

• Interface segregation principleMany client-specific interfaces are better than one general-purpose interface.

DIP

• Dependency inversion principleOne should “Depend upon Abstractions. Do not depend upon concretions.

Questions

Contact Me

• Email : c.abhilash@gmail.com• Twitter : https://twitter.com/cabhilash• Blog : http://www.TheAgileSchool.com