Tag Archives: Domain Model

Topic 15 – Advanced Software Design

Why do I need to learn about advanced software design?

I think that I already learned about software design in the Topic 12 – Introduction to Software Design.

Now your task is not just to build a house.  Your task is to build a city. 

The situation is similar to when you create complex software. Now, you are responsible for creating a software system containing about 10,000 classes for 5,000 people to use in 15 years. The maximum system downtime must be less than 5 minutes per year.
Image that you have to create a system that serves millions of people simultaneously like Facebook or YouTube or Amazon or Office 365 or GMail. Are you able to create it?
Image that you are tasked to create a web framework for developers to extend such as ASP.NET CORE or Yii or React.js. Are you confident in creating one?
If you are not sure how to fulfill these tasks then probably, you should learn how other people crafted similar systems and adapt their experiences to your case. Advanced software design knowledge will then be useful for you.

What can I do after finishing learning advanced software design?

You will know how to design a complex software system that satisfies not only functional requirements but also security, modifiability, scalability, reusability, extensibility and reliability requirements.

That sounds interesting! What should I do now?

Advanced software design requires a lot of reading. Please do review the software design knowledge introduced to you in the Topic 12 - Introduction to Software Design first.
Nowadays software can be applied to many fields. Each of them requires specific advanced software design knowledge. In this topic, we only focus on enterprise software because of its popularity.
Before you design a complicated system you must thoroughly  understand its sophisticated requirements. This is a critical step when building a large system.

Please read this "David C. Hay (2002). Requirements Analysis: From Business Views to Architecture" book to learn how to capture requirements for an enterprise system.
After that please read 
- this "Deepak Alur et al. (2003). Core J2EE Patterns: Best Practices and Design Strategies" book, and
- this "Martin Fowler (2002). Patterns of Enterprise Application Architecture" book, and
- this "Philip A. Bernstein and Eric Newcomer (2009). Principles of Transaction Processing. Second Edition" book.
After that please read 
- this "Eric Evans (2003). Domain-Driven Design: Tackling Complexity in the Heart of Software" book and
- this "Jimmy Nilsson (2006). Applying Domain-Driven Design and Patterns: With Examples in C# and .NET" book and 
- this "Philip A. Bernstein and Eric Newcomer (2009). Principles of Transaction Processing. Second Edition" book.
After that please read 
- this "Cloves Carneiro Jr. and Tim Schmelmer (2016. Microservices from Day One: Build robust and scalable software from the start" book, and 
- this "Sam Newman (2016). Building Microservices: Designing Fine-Grained Systems" book.

After finishing the books please click Topic 16 – Calculus to continue.

Topic 9 – Software Requirements

Why do I need to learn about software requirements?

Your software can only be successful if it helps people do their work better, or faster, or with a lower cost. In order to achieve this objective, it must fulfill the need of various users.

To fulfill users' needs you need to be able to identify their context, problems and desires, then propose software solutions for their issues.
Your software solutions must be built based on its users' requirements. So you need to be able to collect, document, manage and validate their requirements. Software requirements engineering will provide you knowledge for completing these tasks.

Do not waste your time to create software that NO ONE will use. Your software will only become useful if its requirements are correctly engineered.

What can I do after finishing learning software requirements engineering?

You will know how to elicit, document, manage and validate software requirements so that they can be used for creating your software.

Hmm! Is it really useful?

If you have a doubt about its usefulness then you can delay learning it until you are tasked to create a software system but you do not know where to begin or what are the inputs for your coding.
Another scenarios that may suggest that you should come back to this topic is when you will have created an application but then you, unfortunately, find that no one wants to use it.

Alright! What should I do now?

Please read this Suzanne Robertson and James Robertson (2012). Mastering the Requirements Process. Addison Wesley Professional book.

After that please read this Karl Wiegers and Joy Beatty (2013). Software Requirements. Microsoft Press book.

After that please read this Joy Beatty and Anthony Chen (2012). Visual Models for Software Requirements. Microsoft Press book.

After that, please read this Alistair Cockburn (2001). Writing Effective Use Cases. Addison-Wesley book.

Then please review this "ISO/IEC/IEEE 29148:2011(E)" standard so that you could create a quality software requirements specification.

After that, please read this Mike Cohn (2004). User Stories Applied: For Agile Software Development. Addison-Wesley Professional book.

After that, please read this Jeff Patton and Peter Economy (2014). User Story Mapping. O'Reilly Media book.

After that, please read this Dean Leffingwell (2011). Agile Software Requirements. Lean Requirements Practices for Teams, Programs, and the Enterprise. Addison-Wesley Professional book.
After finishing the books please click Topic 10 - Software Construction to continue.

Lessons learned

Our goal is to ensure the project’s success and client’s satisfaction.

In order to achieve this goal our delivered solution should solve our client’s problems/needs. Analysis and communication are critical to ensure that our deliverables match with Client’s needs.

It does not matter whether we use RUP or Agile, UML or boxes or text, coded prototypes or paper and pen, the client and analyst should review, refine and confirm the problem specification regularly.

Otherwise a formal requirements should be modeled, reviewed and confirmed to ensure the project will deliver the solution to the right problem.