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Why the Software Industry Has a Love-Hate Relationship with UML Diagrams

Updated on: 01 December 2022 | 8 min read
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UML is a versatile visual language that is used to model a software system. The software industry has been divided in its opinion regarding the use of UML diagrams. While some see it as an integral part of software systems and development, there are a significant number of people that deem it completely unnecessary.

In this post, we explore both sides of this argument (both advantages and disadvantages of UML) and attempt to understand software industry’s love-hate relationship with UML design diagrams.

Advantages of UML

Most-Used and Flexible

UML is a highly recognized and understood platform for software design. It is a standard notation among software developers. You can safely assume that most software professionals will be at least acquainted with, if not well-versed in, UML diagrams, thus making it the go-to alternative to explain software design models.

What makes UML well-suited to and much-needed for software development is its flexibility. You can customize your modeling elements and interactions in a UML diagram specifically to suit the domain or technologies you are using.

The Software Architecture Must Be Communicated Effectively

The software architecture is the blueprint of the system. It is the framework on which the efficiency of the system and its processes depend. But, this framework is only effective if it is communicated properly to all those using it and working on it. This is where Unified Modeling Language (UML) comes into the picture.

UML is a rich and extensive language that can be used to model not just object-oriented software engineering, but application structure and behavior, and business processes too. Software players have agreed that we cannot do away with documentation of the architecture. It is important. It helps in assessing performance, security, tracking, and provides important guidelines for the assignment under operation.

Because of its wide reach, UML is the perfect visual language to communicate detailed information about the architecture to the largest number of users.

You Need to Know Only a Fraction of the Language to Use It

UML Diagram Types

Though there are 14 different types of UML diagrams for modeling applications, developers use only three or four to document a software system. Class diagrams, sequence diagrams, and use case diagrams remain the most in vogue.

What this implies is that you need to know just 20% of the UML language to explain 80% of your modeling needs. You do not need to know or comprehend the entire notation, to communicate effectively using UML diagrams. Knowing a subset of the notation equips you just fine.

Abundance of UML Tools

UML tools are one of the most important reasons why UML is so widely used. UML tools range from free open-source software to those costing millions of dollars. These tools cover much territory beyond just drawing diagrams. They can generate code from the design, apply design patterns, mine requirements, reverse engineer code, and perform impact and complexity analysis.

These advantages and the abundance of UML tools itself make UML the go-to modeling and developmental language in the field of software engineering.

Despite its myriad uses and benefits, UML is not preferred by all. In fact, a considerable section of software developers, don’t use UML and heap heavy criticism on the same. Let’s look at the arguments against using UML.

Disadvantages of UML: Reasoning against UML

Formal Notation is Not Necessary

The strongest argument against UML is that you don’t really need a UML diagram to communicate your designs. You can have the same impact and effect with informal, box-and-line diagrams created in PowerPoint, Visio, or a whiteboard. As coding is a formal language by itself, a lot of developers don’t prefer the complexity and the formality at the architectural level, which discourages the use of UML and has become one of its disadvantages.

Ascending Degree of Complexity

Since its initiation until now, UML has grown in complexity and size. The sheer size of UML makes a lot of people nervous right at the onset, and they feel like they won’t be able to learn it, and are better off without it.

Not Necessary in ‘Architecture-Indifferent Design’

A term coined by George Fairbanks, ‘architecture-indifferent design is a situation where UML is considered unnecessary.

At its core, an architecture-indifferent design refers to a software architecture that is simple and basic, and does not need any complex diagrams to represent or explain the design. If the firms lay more emphasis on formal coding, and there is a prevalent culture of minimal design documentation, UML is regarded unnecessary.

Deciphering This Love-Hate Relationship:

While there is much talk about the redundancy of UML in the software industry, it cannot be denied that hitherto, there is no holistic or appropriate substitute for UML. To receive an unbiased perspective on the significance and fate of UML, we spoke to hardware giants who are closely in touch with the software industry, but neutral in their perspective.

“Absence of design documentation is fine in the short-run, but it can become a problem in the long run when you need to communicate the design to a developer who is in another country, or someone who will be joining the team six months later. UML becomes a huge help in such circumstances, and alleviates ambiguity and questions regarding the design.” A representative at Sconect, Female Header Manufacturer, opines.

“We may talk about domain-specific languages for visual modeling, but the fact remains that none of them have found wide acceptance, which only asserts that UML remains the best alternative as far as visual languages are concerned.” This observation was very interestingly put forth by a representative at Scondar, which specializes in manufacturing pin header connectors.

Inputs from a representative at Ismolex aptly summarize the case of software industry’s love-hate relationship with UML design diagrams. “There may be a thousand arguments against the use of UML, but owing to its ability to capture the nuances of information about design architecture, and with the increasing importance of design documentation, UML remains irreplaceable.”

Advantages and Disadvantages of UML: Which Side are You on?

The denials and the adherences to UML diagrams will continue in the software circles. But, UML is here to stay. UML diagrams, however, need to be continuously upgraded so that their usage is not limited to just architecture description and communication, but broadened to represent and create systems that can accommodate dynamic changes.

About Author

I’m Rachel Oliver, I have been working for the past couple of years as a freelance writer and currently associated with Ismolex – Pin header manufacturer. While I like to write about all things under the sun, including energy, business, sports, home improvement and fashion, I am especially passionate about business, technology, and electronics. You can get in touch with me on Google+, Facebook and Twitter.

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FAQs About Advanatges and Disadvantages of UML Diagrams

What are the other advantages of UML (Unified Modeling Language)?
  • Software developers and other stakeholders can communicate and comprehend complex system designs because of UML’s standardized notation.

  • Using visual diagrams, such as class diagrams, sequence diagrams, and activity diagrams, UML makes it simpler to understand and convey a system’s structure and behavior.

  • By providing developers, designers, and stakeholders with a single language to communicate in, UML diagrams improve collaboration and minimize miscommunication.

  • Planning and Design Processes are More Efficient as the UML’s clear and systematic approach to system analysis, design, and modeling, planning and design processes are more effective in the early stages of software development.

  • By enabling the early detection of potential problems, ambiguities, and inconsistencies, UML aids software analysis and testing activities and produces higher-quality software.

What are the other disadvantages of UML?
  • It takes a lot of time and effort to learn and master UML because it is a sophisticated language with many different diagram kinds and notations.

  • Large and complicated systems can result in complex UML diagrams that are challenging to comprehend and maintain, especially for team members with less experience.

  • Inadequate precision and detail in UML diagrams can occasionally result in ambiguity and incorrect understanding of system requirements and design.

  • It can take a lot of effort to create and maintain UML diagrams, especially for large-scale projects that may need devoted resources and specialized tools.

  • For some domains or projects that call for quick flexibility, UML diagrams are less suitable because they are largely static representations of a system and may not adequately capture dynamic or real-time aspects.

Common mistakes when working with UML include:
  • Misreading or Abusing Notations: The various elements and relationships are represented by distinct notations and symbols in UML. Confusion and poor communication might result from misreading or improper use of these notations. It’s essential to comprehend how to use UML notations correctly and to use them consistently across the diagrams.

  • Diagrams that are inconsistent or incomplete can lead to misconceptions and improper system designs. UML diagrams should be consistent and thorough. It is critical to make sure that all diagrams used to describe a system are consistent with one another and offer a thorough understanding of the structure and behavior of the system.

  • Neglecting Documentation: To give context, explanations, and supplementary information, UML diagrams should be well documented. Failure to properly document the schematics can make it difficult for others to comprehend and utilize them.

  • Ignoring Stakeholder Participation: UML diagrams are designed to encourage stakeholder collaboration and communication. Stakeholders' requirements or expectations may not be met by designs if they are not included in the UML modeling process or if their input is not taken into account.

  • Using UML as a Substitute for Clear Thinking: Although UML is a tool for communicating and visualizing system designs, it shouldn’t be used in place of clear thinking and a thorough understanding of the issue domain. Before converting the concepts and requirements into UML diagrams, it’s critical to understand them first.

  • Relying Only on UML Diagrams: Although UML diagrams help to depict systems, they shouldn’t be the only source of knowledge for software development. UML diagrams must be used in conjunction with other types of documentation, such as user stories, architectural documents, and textual requirements, to ensure a thorough understanding of the system.


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