Vijay Krishna's Notes http://vijaykrishna.posterous.com Most of my notes as a student of computer software and everything around it. posterous.com Wed, 16 Nov 2011 12:27:00 -0800 The 2nd Time Dimension of the Vee SDLC Model http://vijaykrishna.posterous.com/the-2nd-time-dimension-of-the-vee-sdlc-model http://vijaykrishna.posterous.com/the-2nd-time-dimension-of-the-vee-sdlc-model

So i was reading about the vee-model today as a part of my readings for the SE class i am taking this term. The model was developed by NASA and it made a lot of sense to me, with the feedback between the various stages of the development prcosses across the two legs of the V. And then i got to the part where it spoke of time being represented on two axeses: the x and the z.

That is when i stopped, and opened by editor to jot down this post. Why would you want to represent the same quantity over two different dimensions, especially when they are representing the same thing?

The v- model, being three-dimensional, also has an axis that is normal to the plane, the z-axis. This represents components associated with multiple deliveries. Time is therefore represented by two axes: from left to right and into the plane.

- Ruparelia, N. B. (2010). Software development lifecycle models. ACM SIGSOFT Software Engineering Notes, 35(3), 8. doi:10.1145/1764810.1764814

So as pointed out by Ruparelia above, the z-axis is to showcase the multi deliverable software. One direct idea that comes to mind when you read this is that if the software was to be delivered multiple times, then it would be reasonable to assume that it the deliveries are to happen sequentially. And hence, the same V can be repeated in the Y-axis. Thus giving a more streamlined and uniform picture of the history of deliveries of the software.

Such an axis would make sense if, the same lifecycle were to be repeated in nearly the same time span, but in parallel for many deliverables of the same product. Now, i don't know if such a thing would even be possible. But to me it only makes sense then.

That being said, I am open to hear out other ideas and explanations for this 2nd dimension of time.

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