Looking Along the Beam: Analysis and Insight
Looking Along the Beam: Analysis and Insight
Explore what we can learn about writing software by standing in a dark toolshed with the door closed.
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I've been doing some work on team organization lately, and it's caused me to return to an idea I had about "defining process". Working in the defense industry, of course I've seen a lot of plans and procedures for writing software. One of my favorite things to do is to spot what I call the "magic happens here" step.
It's a fun game to play. Take a design process like this one. I picked this one not because it's unique, since what I'm describing is universal, but just because it was in the first page of Google results for "software design process".
Under "System Analysis", it says, "[a]t this stage the system is divided into smaller parts to make it easier [and] more manageable for the developers, designers, testers, project managers and other professionals who are going to work on the software in the latter stages."
Did you spot the "magic happens here" step? The clue is the use of the passive voice. The system "is divided". By whom? What are the smaller parts? How do you know that the smaller parts you've chosen are the right ones? This illustrates a core problem with process documents (and with methodologies like Statistical Process Control. Nothing in the process is going to help you figure out whether what you've built is any good or not. If what you're building is bad, process control is great at making sure you're consistently terrible.
Thinking about this, I realized that there's an interesting parallel to C.S. Lewis' "Meditation in a Toolshed". Those who think of Lewis as a writer of children's stories may not be aware that he was a respected literary critic and an expert on Medieval and Renaissance literature. In this particular essay, he writes about being in a dark toolshed, with one beam of light coming through a crack in the door. He starts by looking at the beam of light, with specks of dust floating in it. Then, he shifts so he is looking along the beam. Immediately, instead of seeing the beam, he sees outside to trees and the sun.
In our thinking process, what we call "analysis" is like looking at the beam. The word "analysis" itself comes from a Greek word meaning "loosen". With analysis, we are separating things into their parts so we can understand how each part works and how they fit together. Planning for software development is much like that; we devise grand plans for how we're going to get started on a new piece of software. What actions do we need to take first? How do those actions help us with the next actions (process inputs and process outputs)? What are the parts of the software itself and how do they fit together?
Lewis believed that the modern mind prioritizes analysis over other ways of knowing and understanding things, because of the phenomenal success that modern science has had in taming the natural world. It seems to me that engineers tend to be even more inclined toward analysis than the average person, because taming the natural world is what engineers do. And in areas like software, where chaos is at a maximum, our desire to analyze, comprehend, and fully specify a software engineering process is also at a maximum.
The other way of looking at something is of course "synthesis", which comes from a Greek word for placing together. On a couple occasions when I've written a piece of software of which I was later inordinately proud, I found that it was necessary to struggle to hold "the whole thing" in my mind at once in order to see how particular pieces of it should be implemented.
But I don't want it to sound like I'm trying to encourage software engineers to adopt a mindset of synthesis over analysis, for a couple reasons. First, as Lewis points out in his essay, both forms of seeing are valid. "One must look both along and at everything." Second, while you're looking along the beam, you're focused on something else external. That is what you're looking at. In software engineering, synthesis comes when we're focused not on synthesis but on the real-world problem we're trying to solve. To try to "get" synthesis is fatal, because you start thinking about the mental process of synthesis rather than the thing you're trying to synthesize.
To me this is the fundamental flaw of all of the "creative" procedures like "brainstorming". At a minimum, it's a silly exercise where we write down the good ideas we already had and some ideas we know are bad to fill the space. At its worst, we end up analyzing brainstorming, breaking it into 10 Longtime Brainstorming Techniques That Still Work. Our attempt to "be creative" ends in having one more process to follow and the "magic happens here" has still eluded us.
One final note: this way of thinking has helped me better understand and accept that most of my arguments for a particular architecture or design approach are really post-hoc rationalizations for decisions made unconsciously. Often, where I've put together an architecture that ended up working well, the best features of it are emergent. I didn't go in specifying that things would work a certain way; instead, they worked a certain way because of the necessary interaction of parts that were put in place for a different reason.
For example, in one architecture I worked, I designed the application layer to send asynchronous messages to update user displays whenever data would change. This approach ended up simplifying both the keeping of an event log and the integration of external components from outside the architecture, but that was not my original reason. My reason is that the legacy system I was replacing had allowed display-specific logic to creep down into the application layer, and the asynchronous messages were an architectural separation to prevent that in the new system. And even that reasoning is somewhat post-hoc; the truth is that the approach just "felt" right.
This article has been intentionally descriptive, not prescriptive, because I don't think there's anything you can "do" to make sure you're properly balancing these two ways of seeing. For what it's worth, I've found it helpful just to recognize that this perspective exists and not to expect too much out of a single approach.
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