Why Agile and Scrum Matter

Changes is constant, software development as well. Do you know the development of mobile phones, starting from Motorola DynaTAC (1973) to Iphone 6 (2014). How about the software? The new versions are released with new improvements.

Software is not always able to automatic repairing. Therefore, software should be changed frequently and we need responding to changes.

source: http://answers.microsoft.com/

In working software today, how about customers' collaboration or requirements?

We ignore the fact that many customers don't know what they want.
We ignore the fact that when they know what they want, they can't describe it.
We ignore the fact the even when they can describe it, they often a proposed solution rather than a real need.
We ignore, that a lot of customers give us a solution but not the problem.

source: http://accelerateddevelopment.blogspot.com/

And, in working process, earlier founded bugs are cheaper.

Manifesto for Agile Software Development:

Individual and interaction over processes and tools
Working software over comprehensive documentation
Customer collaboration over contract negotiation
Responding to change over following a plan.

Scrum is an iterative and incremental agile software development methodology for managing product development. Agile is the way to think about responsiveness to changes and Scrum is a framework for increasing the speed and feedback loop.

Waterfall vs Scrum:

Waterfall process

Scrum process

source: https://en.wikipedia.org/

Rather than doing all of one thing at a time, Scrum teams do a little of everything all the time.

Twelve Agile Principles:

1. Produce Value Early	7. Working software
2. Welcome Changes	8. Sustainable development
3. Iterative Delivery	9. Technical excellent
4. Daily Business Collaboration	10. KISS – Smart, Sexy
5. Trust motivated team	11. Self-Organized team
6. Face to face	12. Reflect, Adjust, Adapt

Things are fit for Scrum:

	Agile	Lean	Kanban	Scrum	XP
Type	The way to THINK	Production PRACTICE	METHOD	FRAMEWORK	Technical PRACTICE
Goal	Responsiveness to changes	Reducing waste	Maximize the flow	Increase the speed and feedback loop	Improve software quality
Implementation	- Agile manifesto - 12 Agile Principles	With principles and practices	Whiteboard	Sprint	- TDD - Paring - Swarming

References:

[1]. "Fit for Scrum" course - Mr. Sebastian Sussmann - CIO, Axon Active Vietnam
[2]. http://www.agilemanifesto.org/
[3]. http://www.agilemanifesto.org/principles.html

Comments

Styling Sort Icons Using Font Awesome for Primefaces' Data Table

So far, Primefaces has used image sprites for displaying the sort icons. This leads to a problem if we want to make a different style for these icons; for example, I would make the icon "arrow up" more blurry at the first time the table loading because I want to highlight the icon "arrow down". I found a way that I can replace these icons with Font Awesome icons. We will use "CSS Pseudo-classes" to achieve it. The hardest thing here is that we should handle displaying icons in different cases. There is a case both "arrow up" and "arrow down" showing and other case is only one of these icons is shown. .ui-sortable-column-icon.ui-icon.ui-icon-carat-2-n-s { background-image: none; margin-left: 5px; font-size: 1.1666em; position: relative; } .ui-sortable-column-icon.ui-icon.ui-icon-carat-2-n-s:not(.ui-icon-triangle-1-s)::before { content: "\f106"; font-family: "FontAwesome"; position: ...

[Snippet] CSS - Child element overlap parent

I searched from somewhere and found that a lot of people says a basic concept for implementing this feature looks like below: HTML code: <div id="parent"> <div id="child"> </div> </div> And, CSS: #parent{ position: relative; overflow:hidden; } #child{ position: absolute; top: -1; right: -1px; } However, I had a lot of grand-parents in my case and the above code didn't work. Therefore, I needed an alternative. I presumed that my app uses Boostrap and AngularJs, maybe some CSS from them affects mine. I didn't know exactly the problem, but I believed when all CSS is loaded into my browser, I could completely handle it. www.tom-collinson.com I tried to create an example to investigated this problem by Fiddle . Accidentally, I just changed: position: parent; to position: static; for one of parents -> the problem is solved. Look at my code: <div class="modal-body dn-placeholder-parent-positi...

Strategy Design Pattern

For example, I have a program with an Animal abstract class and two sub-classes Dog and Bird. I want to add new behavior for the class Animal, this is "fly". Now, I face two approaches to solve this issue: 1. Adding an abstract method "fly" into the class Animal. Then, I force the sub-classes should be implemented this method, something like: public abstract class Animal{ //bla bla public abstract void fly(); } public class Bird extends Animal{ //bla bla public void fly(){ System.out.println("Fly high"); } } public class Dog extends Animal{ //bla bla public void fly(){ System.out.println("Cant fly"); } } 2. Creating an interface with method "fly" inside. The same issue to an abstract class, I force the classes these implement this interface should have a method "fly" inside: public interface Flyable{ public void fly(); } public class Bird implements Flyable{ //bla bla public void fly(){ System.out.pr...

Junit - Test fails on French or German string assertion

In my previous post about building a regex to check a text without special characters but allow German and French . I met a problem that the unit test works fine on my machine using Eclipse, but it was fail when running on Jenkins' build job. Here is my test: @Test public void shouldAllowFrenchAndGermanCharacters(){ String source = "ÄäÖöÜüß áÁàÀâÂéÉèÈêÊîÎçÇ"; assertFalse(SpecialCharactersUtils.isExistSpecialCharater(source)); } Production code: public static boolean isExistNotAllowedCharacters(String source){ Pattern regex = Pattern.compile("^[a-zA-Z_0-9_ÄäÖöÜüß áÁàÀâÂéÉèÈêÊîÎçÇ]*$"); Matcher matcher = regex.matcher(source); return !matcher.matches(); } The result likes the following: Failed tests: SpecialCharactersUtilsTest.shouldAllowFrenchAndGermanCharacters:32 null A guy from stackoverflow.com says: "This is probably due to the default encoding used for your Java source files. The ö in the string literal in the J...

Multiple Inheritance of State and Implementation

Today, I was just curious about why an enum can not extend anything else. I took a look on the Oracle document here , and I found the answer is below: "All enums implicitly extend java.lang.Enum. Because a class can only extend one parent (see Declaring Classes), the Java language does not support multiple inheritance of state (see Multiple Inheritance of State, Implementation, and Type), and therefore an enum cannot extend anything else." I have been learned of it before. But, wait a sec...! Why Java does not support multiple inheritance of state? Since I have worked with other programming languages like C++, I was able to make a class extend some other classes. The short answer is to avoid the issues of multiple inheritance of state . I wonder if other programming languages have these below terms but Java does. Multiple inheritance of state It is the ability to inherit fields from multiple classes. There is a problem and Java avoids it. "For exa...

vhandit

Search This Blog