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 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.

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.

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:

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.

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.

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.

Description:

A data-flow diagram is a way of representing a flow of a data of a process or a system.
Advantages of data flow diagram:

disadvantages

psudocode would only be used in the planning process to figure out what the code needs to do and how it needs to be layed out in porder to fulfill