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A New Software Engineering

What happened to the promise of rigorous, disciplined, professional practices for software development?

Ivar Jacobson and Ed Seidewitz, Ivar Jacobson International

What happened to software engineering? What happened to the promise of rigorous, disciplined, professional practices for software development, like those observed in other engineering disciplines?

What has been adopted under the rubric of "software engineering" is a set of practices largely adapted from other engineering disciplines: project management, design and blueprinting, process control, and so forth. The basic analogy was to treat software as a manufactured product, with all the real "engineering" going on upstream of that—in requirements analysis, design, modeling, etc. 

Doing the job this way in other engineering disciplines makes sense because the up-front work is based on a strong foundational understanding, so the results can be trusted. Software engineering has had no such basis, so "big up-front design" often has just not paid off. Indeed, the ethos of software engineering has tended to devalue coders (if not explicitly, then implicitly through controlling practices). Coders, though, are the ones who actually have to make the software work—which they do, regardless of what the design "blueprints" say should be done.

Not surprisingly, this has led to a lot of dissatisfaction.

Today's software craftsmanship movement is a direct reaction to the engineering approach. Focusing on the craft of software development, this movement questions whether it even makes sense to engineer software. Is this the more sensible view?

Since it is the code that has to be made to work in the end anyway, it does seem sensible to focus on crafting quality code from the beginning. Coding, as a craft discipline, can then build on the experience of software "masters," leading the community to build better and better code. In addition, many of the technical practices of agile development have made it possible to create high-quality software systems of significant size using a craft approach—negating a major impetus for all the up-front activities of software engineering in the first place.

In the end, however, a craft discipline can take you only so far. From ancient times through the Middle Ages, skilled artisans and craftsmen created many marvelous structures, from the Pyramids to Gothic cathedrals. Unfortunately, these structures were incredibly expensive and time consuming to build—and they sometimes collapsed in disastrous ways for reasons that were often not well understood.

Modern structures such as skyscrapers became possible only with the development of a true engineering approach. Modern construction engineering has a firm foundation in materials science and the theory of structures, and construction engineers use this theoretical foundation as the basis of a careful, disciplined approach to designing the structures they are to build.

Of course, such structures still sometimes fail. When they do, however, a thorough analysis is again done to determine whether the failure was caused by malfeasance or a shortcoming in the underlying theory used in the original design. Then, in the latter case, new understanding can be incorporated into the foundational practice and future theory.

Construction engineering serves as an example of how a true engineering discipline combines craftsmanship with an applied theoretical foundation. The understanding captured in such an accepted foundation is used to educate entrants into the discipline. It then provides them with a basis for methodically analyzing and addressing engineering problems, even when those problems are outside the experience of the engineers.

From this point of view, today's software engineering is not really an engineering discipline at all.

What is needed instead is a new software engineering built on the experience of software craftsmen, capturing their understanding in a foundation that can then be used to educate and support a new generation of practitioners. Because craftsmanship is really all about the practitioner, and the whole point of an engineering theory is to support practitioners, this is essentially what was missing from previous incarnations of software engineering.

How does the software community go about this task of "refounding" software engineering?

The SEMAT (Software Engineering Method and Theory) initiative is an international effort dedicated to answering this question ( As the name indicates, SEMAT is focusing both on supporting the craft (methods) and on building foundational understanding (theory).

This is still a work in progress, but the essence of a new software engineering is becoming clear. The remainder of this article explores what this essence is and what its implications are for the future of the discipline.

Engineering is Craft Supported by Theory

A method (equivalently, methodology or process) is a description of a way of working to carry out an endeavor, such as developing software. Ultimately, all methods are derived from experience with what does and does not work in carrying out the subject endeavor. This experience is distilled, first into rules of thumb and then into guidelines and, when there is consensus, eventually into standards.

In a craft discipline, methods are largely developed by masters, who have the long experience necessary. In older times, the methods of a master were closely guarded and passed down only to trusted apprentices. In today's world, however, various approaches based on the work of master craftsmen are often widely published and promoted.

As a craft develops into an engineering discipline, it is important to recognize commonality between the methods of various masters, based on the underlying shared experience of the endeavor being carried out. This common understanding is then captured in a theory that can be used as a basis for all the different methods to be applied to the endeavor.

In this sense, theory is not the bad word it is sometimes treated as in our culture ("Oh, that's just a theory"). As noted earlier, having a theoretical foundation is, in fact, the key that allows for disciplined engineering analysis. This is true of materials science for construction engineering, electromagnetic theory for electrical engineering, aerodynamics for aeronautical engineering, and so forth.

Of course, the interplay between the historical development of an engineering discipline and its associated theory is generally more complicated than this simple explanation implies. Engineering experience is distilled into theory, which then promotes better engineering, and back again. Nevertheless, the important point to realize here is this: traditional software engineering did not have such an underlying theory.

One might suggest that computer science provides the underlying theory for software engineering—and this was, perhaps, the original expectation when software engineering was first conceived. In reality, however, computer science has remained a largely academic discipline, focused on the science of computing in general but mostly separated from the creation of software engineering methods in industry. While "formal methods" from computer science provide the promise of some useful theoretical analysis of software, practitioners have largely shunned such methods (except in a few specialized areas such as methods for precise numerical computation).

As a result, there have often been cycles of dueling methodologies for software "engineering," without a true foundational theory to unite them. In the end, many of these methods didn't even address the true needs of the skilled craft practitioners of the industry.

So, how to proceed?

The creation of a complete, new theory of software engineering will take some time. Rather than starting with an academic approach, we can begin, as already mentioned, by capturing the commonality among the methods that have proven successful in the craft of software development. This, in turn, requires a common way of describing, understanding, and combining various software-development techniques, instead of setting them up in competition with each other.

To see how this might be accomplished, let's take a closer look at methods and the teams of practitioners that really use them.

Agility is for Methods, not just Software

The current movement to promote agility in software development complements the recognition of software craftsmanship. As the name suggests, agile software development is about promoting flexibility and adaptability in the face of inevitably changing requirements. This is done by producing software in small increments, obtaining feedback in rapid iterations, and continually adjusting as necessary.

Agile software development teams take charge of their own way of working. Such a team applies the methods it feels it needs for the project at hand as they are needed, adapting the development process throughout a project. In effect, an agile team needs to evolve and improve its methods in as agile a fashion as it develops its software.

A lack of agility in methods is a central failure of traditional software engineering.

Software is, by its very nature, malleable and (physically) easy to change. A complicated software system, however, can exhibit a kind of intellectual rigidity in which it is hard to make changes correctly, with each change introducing as many or more errors as it resolves. In the face of this, the response of traditional software engineering was to adopt process-control and project-management techniques such as those used to handle similar problems with complicated hardware systems.

From an agile viewpoint, however, the application of hardware-engineering techniques was a mistake. Agile techniques, instead, take advantage of the changeable nature of software, using quick feedback cycles allowed by continuous integration and integrated testing to manage complexity, rather than process control. As a result, agile development focuses on supporting the practitioner in building quality software, rather than requiring the practitioner to support the process.

So, how do you introduce agility into software-engineering methods? By looking at the basic things that practitioners actually do—their practices.

Methods are Made from Practices

A method may appear monolithic, but any method may be analyzed as being composed of a number of practices. A practice is a repeatable approach to doing something with a specific purpose in mind. Practices are the things that practitioners actually do.

For example, the agile method of Extreme Programming is described as having 12 practices, including pair programming, test-driven development, and continuous integration. The agile framework Scrum, on the other hand, introduces practices such as maintaining a backlog, daily scrums, and sprints. Scrum is not really a complete method but a composite practice built from a number of other practices designed to work together. Scrum, however, can be used as a process framework combined with practices from, say, Extreme Programming, to form the method used by an agile team.

That exemplifies the power of explicitly considering how methods are made up of practices. Teams can pull together the practices that best fit the development task at hand and the skills of the team members involved. Further, when necessary, a team can evolve its method not only in small steps, but also in more radical and bigger steps such as replacing an old practice with a better practice (without having to change any other practices).

Note how the focus is on teams and the practitioners in teams, rather than "method engineers," who create methods for other people to carry out. Creating their own way of working is a new responsibility for a lot of teams, however, and it is also necessary to support a team's ability to do this across projects. It is also useful, therefore, to provide for groups interested in creating and extending practices, outside of any specific project, so they can then be used as appropriate by project teams.

This can be seen as a separation of concerns: practices can be created and grown within an organization, or even by cross-organization industry groups (such as is effectively the case with Extreme Programming and Scrum); practitioners on project teams can then adopt, adapt, and apply these practices as appropriate.

What assurance do project teams have that disparately created practices can actually be smoothly combined to produce effective methods? This is where a new software-engineering foundation is needed, independent of practices and methods but able to provide a common underpinning for them.

The Kernel is the Foundation for Practices and Methods

The first tangible result of the SEMAT initiative is what is known as the kernel for software engineering. This kernel can be thought of as the minimal set of things that are universal to all software-development endeavors. The kernel consists of three parts:

* A means for measuring the progress and health of an endeavor.

* A categorization of the activities necessary to advance the progress of an endeavor.

* A set of competencies necessary to carry out such activities.

Of particular importance is having a common means for understanding how an endeavor is progressing. The SEMAT kernel defines seven dimensions for measuring this progress, known as alphas. (The term alpha was originally an acronym for abstract-level progress health attribute but is now simply used as the word for a progress and health dimension as defined in the kernel. Many other existing terms were considered, but all had connotations that clashed with the essentially new concept being introduced for the kernel. In the end, a new term was adopted without any of the old baggage.) The seven dimensions are: opportunity, stakeholders, requirements, software system, work, team, and way of working. These alphas relate to each other as shown in figure 1.

A New Software Engineering: The Kernel Alphas

Each alpha has a specific set of states that codify points along the dimension of progress represented by the alpha. Each of the states has a checklist to help practitioners monitor the current state of their endeavor along a certain alpha and to understand the state they need to move toward next. The idea is to provide an intuitive tool for practitioners to reason about the progress and health of their endeavors in a common, method-independent way.

One way to visualize the seven-dimensional space of alphas is using the spider chart1 shown in figure 2. In this chart, the shaded area represents how far an endeavor has progressed, while the white area shows what still needs to be completed before the endeavor is done. A quick look at such a diagram provides a good idea of where a project is at any point in time.

A New Software Engineering: Tracking Progress with Alphas

The alphas can be made even more tangible by putting each of the alpha states on a card, along with the state checklist in an abbreviated form (see figure 3). The deck of all such cards can then fit easily into a person's pocket. Although more detailed guidelines are available, these cards contain key reminders that can be used by development teams in their daily work, much like an engineer's handbook in other disciplines.

A New Software Engineering: Alphas Made Tangible with Cards

A more complete discussion of the kernel and its application is available in previous work.2,3 The kernel itself is formally defined as part of the Essence specification that has been standardized through the Object Management Group.6 In addition to the full kernel, the Essence standard also defines a language that can be used both to represent the kernel and to describe practices and methods in terms of the kernel. Importantly, this language is intended to be usable by practitioners, not just method engineers; for basic uses, it can be learned in just a couple of hours (the alpha state cards are a simple example of this).

Of course, this ability to use the kernel to describe practices is exactly what is needed as a foundation for true software engineering methods.

Practices Built on the Kernel Enable Agile Methods

A practice can be expressed in terms of the kernel by:

• Identifying the areas in which it advances the endeavor.

• Describing the activities used to achieve this advancement and the work products produced.

• Describing the specific competencies needed to carry out these activities.

A practice can also extend the kernel with additional states, checklists, or even new alphas.

The critical point is that the kernel provides a common framework for describing all practices and allowing them to be combined into methods. Bringing a set of practices into this common system allows gaps and overlaps to be more easily identified. The gaps can then be filled with additional practices and the overlaps resolved by connecting the overlapping practices together appropriately.

For example, consider two practices: one about using a backlog to manage the work to be carried out by a team (advancing the work alpha), the other about defining requirements using user stories (advancing the requirements alpha). The backlog practice does not prescribe what the items on the backlog must be, while the user-story practice does not prescribe how the team should manage the implementation of those stories. The two practices are thus complementary and can be used together—but, when so combined, they overlap. The two practices can be connected in a smooth and intuitive way within an overall method by identifying backlog items from the one with user stories from the other, so that user stories become the items managed on the backlog.

Note, in particular, how the common framework of the kernel provides a predictive capability. A construction engineer can use materials science and the theory of structures to understand at an early stage whether a proposed building is likely to stand or fall. Similarly, using the kernel, a software developer can understand whether a proposed method is well constructed, and, if there are gaps or overlaps in its practices, how to resolve those.

Further, through the separation of concerns discussed earlier, an organization or community can build up a library of practices and even basic methods that a new project team may draw on to form its initial way of working. Each team can then continue to agilely adapt and evolve its own methods within the common Essence framework.4

Ultimately, the goal will be, as an industry, to provide for the standardization of particularly useful and successful practices, while enhancing, not limiting, the agility of teams in applying and adapting those practices, as well as building new ones as necessary. And that, finally, is the path toward a true discipline of software engineering.


The term paradigm shift may be a bit overused these days; nevertheless, the kernel-based Essence approach to software engineering can quite reasonably be considered to be such a shift. It truly represents a profound change of viewpoint for the software-engineering community.

When Thomas Kuhn introduced the concept of a paradigm shift in his influential book, The Structure of Scientific Revolutions,5 he stressed the difficulty (Kuhn even claimed impossibility) of translating the language and theory of one paradigm into another. The software-development community has actually seen such shifts before, in which those steeped in the old paradigm have trouble even understanding what the new paradigm is all about. The move to object orientation was one such shift, as, in many ways, is the current shift to agile methods.

In this regard, Essence can, indeed, be considered a paradigm shift in two ways. First, those steeped in the "old school" of software engineering have to start thinking about the true engineering of software specifically, rather than just applying practices largely adapted from other engineering disciplines. Second, those in the software craftsmanship and agile communities need to see the development of a true engineering discipline as a necessary evolution from their (just recently hard-won!) craft discipline.

In regard to the second point, in his foreword to The Essence of Software Engineering: Applying the SEMAT Kernel,3 Robert Martin, one of the SEMAT signatories, describes a classic pendulum swing away from software engineering toward software craftsmanship. Martin's assessment is correct, but it is important to note that this proverbial pendulum should not simply swing back in the direction it came. To the contrary, while swing it must, it now needs to swing in almost a 90-degree different direction than the one from which it came, in order to move toward a new discipline of true software engineering.

There is, perhaps, hardly a better image for a paradigm shift than that. In the end, the new paradigm of software engineering, while building on the current paradigm of software craftsmanship, must move beyond it, but it will also be a shift away from the old paradigm of traditional software engineering. And, like all paradigm shifts before, this one will take considerable time and effort before it is complete—at which point, as the new paradigm, everyone will consider its benefits obvious.

Even as it stands today, though, using Essence can provide a team with some key benefits. Essence helps teams to be agile when working with methods and to measure progress in terms of real outcomes and results of interest to stakeholders. These progress measurements are not only on one dimension, but along the seven dimensions of the kernel alphas, all of which need to move along at some pace to reduce risks and achieve results.

Further, Essence can allow organizations to simplify governance of methods, using a pool of practices that may be adopted and adapted by project teams. Having Essence as a common foundation for this also allows practitioners to learn from one another more readily.

The real shift, however, will only come as teams truly realize the benefits of Essence today and as SEMAT builds on Essence to complete the new software engineering paradigm. A community of practitioners is now contributing their experience and becoming part of this "refounding" of software engineering—or, perhaps, really founding it for the first time.


1. Graziotin, D., Abrahamsson, P. 2013. A Web-based modeling tool for the SEMAT Essence theory of software engineering. Journal of Open Research Software 1(1): e4;

2. Jacobson, I., Ng, P-W., McMahon, P., Spence, I., Lidman, S. 2012. The Essence of software engineering: the SEMAT kernel. ACM Queue 10(10);

3. Jacobson, I., Ng, P.-W., McMahon, P. E., Spence, I., Lidman, S. 2013. The Essence of Software Engineering: Applying the SEMAT Kernel. Addison-Wesley.

4. Jacobson, I., Spence, I., Ng, P.-W. 2013. Agile and SEMAT—Perfect Partners. Communications of the ACM 6(11);

5. Kuhn, T. 1962. The Structure of Scientific Revolutions. University of Chicago Press.

6. Object Management Group. 2014. Essence—Kernel and language for software engineering methods;


[email protected]

Ivar Jacobson is the founder and chairman of Ivar Jacobson International. He is a father of components and component architecture, use cases, aspect-oriented software development, modern business engineering, the Unified Modeling Language, and the Rational Unified Process.

Ed Seidewitz is the former CTO, Americas, for Ivar Jacobson International and is currently chair of the ongoing Essence Revision Task Force. With Ivar Jacobson International, he has led agile system architecture and development engagements in both the commercial and government sectors and participated in practice development.

© 2014 ACM 1542-7730/14/1000 $10.00


Originally published in Queue vol. 12, no. 10
see this item in the ACM Digital Library



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Displaying 10 most recent comments. Read the full list here

someone | Thu, 23 Feb 2017 21:46:26 UTC

"So, how do you introduce agility into software-engineering methods?"

Waaaaaaaiiit a minute! As the author has established, software "engineering" is yet another term thrown around in the "IT" industry to relabel the same old thing into something it is not. Just look at all of the job tittles that could all be done with essentially the same training. Now anything remotely related to technology is "engineering"

Anyone can start calling their field "engineering," except those who work in fields that actually are related to engineering. That is, where you actual have a core of knowledge and tools based in physical science and math- an actual defined discipline that someone could actually learn.

An electrical engineering writing code that is part of a system and is validating and testing the system in a formal way is doing the closest thing to software "engineering"

As the beginning of the article points out programming software is NOT engineering- so stop right there and do not misapply "engineering" again by saying "software-engineering methods," as there are none. Quality programming methods, reliable programming methods, or whatever, but in truth NOT engineering.

It is amusing that there is such a disconnect between programming and computer science- yes, you need to "get it done" but then do not try and fool us into thinking what you are doing is "engineering," and that you can say anything about the reliability of your product with any level of certainty. If the formal approach in computer science is too hard for the software "engineers," and is tossed aside for yet another project management scheme, you are moving AWAY from engineering.

What is wrong with calling the job what it is- software programming???

David | Mon, 29 Dec 2014 18:54:25 UTC

I think the bigger problem is that proper software engineering (using consistent, repeatable processes to construct software with minimal defects) requires time and planning that current development management simply is not willing to accommodate unless absolutely required by the use conditions. It costs more to do it right, and in this world, greater cost equals failure.

If we can address that problem -- by putting a premium on operating correctly vs minimum cost -- we might make some progress on this issue. Until we do, the method used to get to the finish line is pretty much irrelevant.

Luis Orduz | Tue, 23 Dec 2014 04:27:13 UTC

More than in building better software, this approach to SW Engineering seems more concerned in building better methods to build better Software. It oddly reminds me of abstraction or indirection levels. I think the Essence framework has merit, however, and better-built software will be, at least, one of its end products. But building good software is still more than (or not exactly) engineering, it will always have something akin to art involved so there's doubt about whether Software craftsmanship will evolve beyond that, or whether it even can evolve beyond that. Maybe the answer is to stop trying to see writing Software as something that can perfectly fill the engineering mold in the way something like construction does. Who knows. Nevertheless, more organization and consensus would definitely improve the situation for everyone, specially with all the different methodologies and their conflicting approaches and followers. So, even if SEMAT's approach doesn't catch on (here's hoping it does), something with at least a similar goal should.

Rafael Anschau | Mon, 08 Dec 2014 05:21:28 UTC

I have found formal methods to be the best bet so far. Modules with pre/post conditions specified at the appropriate level of formality make them much easier to understand and modify and hence to work with. The fact that industry doesn´t use them, shows that the problem is with industry, not with the methods. No engineering discipline would accept working with undefined methods, but here, defined methods belong to CMMI level 3, while 80% of organizations operate bellow CMMI level 2!(McConnel, Software project survival guide). Whenever someone talks about formal methods being "to hard" I imagine a calculus enthusiast -just after calculus has been invented- talking to engineers about the potential of calculus to engineering, just to hear: "Oh, that´s too hard, it´s not practical." Software engineering will be engineering when all organizations operate at CMMI level 3 and use defined methods(formal and informal) which by then should be simply called "the norm" not an exotic state of affairs well above average.

Bob BInder | Sun, 07 Dec 2014 19:30:40 UTC

The notion that whatever software engineering is should be informed by what works in practice is of course reasonable. But so much of software is mediocre at best and very often a dangerous money pit, as studies of technical debt bear out. So, why should we look for inspiration to those responsible for such uneven results?

The identified problem is that "big design up front" and its henchmen trample software artisans, who would save the world if only given the chance. But the best available evidence indicates that Agile projects and their enshrinement of ad hoc development are not significantly better in any respect than the "waterfall" bogeyman. If anything, the value of the Agile point of view is that it assumes we're not as smart as we think, and therefore ought to take small steps to avoid big stumbles. But that's not a new idea. And, as software is the most complex technology the human race has produced, any claim to a "paradigm shift" should have a cogent and proven technical story. Like the rest of Agile, the SEMAT story is technology-free.

I've long argued that making software is most like making movies. Both involve high levels of skill, creativity, and collaboration among diverse technicians and artists to produce a unique artifact The producer-director model works well for organization. Like programmers, actors are the most visible and certainly critical to success. But it is pointless to argue about who is more critical. Weakness in any on- or off-screen role is sufficient to produce a bad result. Of course, we don't depend on movies to run our vehicles, sustain global communications, or to manage our energy, money, health, and food infrastructure.

So, while I very much laud the intention of fixing software's well-known deficiencies and acknowledge that the approach has merit, I don't see any reason to consider the claims of a "paradigm shift" to be more than self-serving hype. Instead of making grandiose claims, presenting evidence that SEMAT's approach isn't yet another concept looking for mindshare would be much more persuasive.

Don O'Neill | Fri, 05 Dec 2014 20:16:22 UTC

My experience is mainly in mission critical large scale complex software systems, and I find the SEMAT Essence Kernel and its Alphas simple yet sufficiently powerful enough to reason straightforwardly about the Alpha state transitions at this scale. In fact, SEMAT is a giant step towards coping with the complexity of software engineering projects. It truly represents the re-founding of software engineering. The profession and perhaps the world will owe Ivars Jacobsen a debt of gratitude before it is all over.

Ian Sommerville | Thu, 04 Dec 2014 19:29:27 UTC

Comparisons between software engineering and other engineering disciplines are dubious in my view as, unlike, engineered physical systems, software systems are abstract entities that are not subject to the laws of physics. The link is to a talk I gave in 2000 making this point.

scaringella | Thu, 04 Dec 2014 11:34:44 UTC

All wrong article .... Software is all about the tool, the language to use in order to reach a goal. Language is the only one tool in software. For each software to create the chosen language must be as close as possible to the perfect one for the goal. The requirements must only drive to the goal then the language tool. Then let the coders, you know, the guys who really do the work, create the software and that's it. How a project is organised is not software it is management. Something every industry has to deal with. Developers use only one tool, language and if listen to carefully would choose the right tool for the goal. But this means either give them time to learn languageS or specialize them in a smaller and smaller sector of software. Then either have devs for each goal or buy devs time for each area. The rest is either management tasks or bullshit to make devs do themselves management work and of course not paid for it (in fact the real goal of all the agile madness).

Ahmed Chicktay | Wed, 03 Dec 2014 15:49:48 UTC

The construction industry has always been a bad analogy for software development, until this changes I think the conclusions will always miss the problem.

RJ | Tue, 02 Dec 2014 03:49:01 UTC

"Software is, by its very nature, malleable and (physically) easy to change"

Errr.. not really.

If by easy to change you mean 'I can fire up an editor and commit a change right now'.. then yes.

If by easy to change you mean 'I can fire up an editor and commit a change WITH GOOD QUALITY right now'.. then absolutely not.

Software, but its very nature, is a very time intensive activity. If quality of the deliverable is of ANY INTEREST AT ALL, then software must be treated as a very very expensive investment, and not as a cheap throw away (I've met WAY too many non-computing types that pick #2 in this list).

And if experience has taught me anything, literally 1% of the entire base of software management understands this.

Note that I started in the 1980s.. so I'm no spring chicken talking here..

I was an architect for Oracle.. and am now senior technical for an industrial software firm.

At this stage, I've become extremely skeptical of ANY method meant to make things better. There is literally no respect paid to ANY software engineering methods at 95% of the software companies extant. In most places, management looks to tooling to create better software, rather than looking to how things are managed. I'd say its the inmates running the asylum, but I literally don't want to insult asylums! Until we've solved the (questionable) leadership component of software, no method will see real success. And that is unfortunately not something the ACM can address, since its those imperfect humans running the show which mess things up.

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