MDA, MDD, MDE

Jordi Cabot has an interesting Blog on Modeling Languages. In it (an on LinkedIn) there was a discussion recently on the difference or similitudes between MDA, MDD, and MDE. It’s interesting that Wikipedia treats the last two as the same thing – I like Jordi’s description better.

However, as I read Jordi’s blog posting, I found that his explanation certainly makes sense and is probably correct nowadays, in a more modern sense of the terms.

However, “MDD” has been used for quite a long time to describe model-based (as opposed to model-driven) development. That use of the term would not fit within the definitions presented by OMG as part of MDA (e.g., the CIM/PIM/PSM levels of abstractions and transformations). I suspect that this approach may also still be in use today – although probably not the best way of working with models. This may especially be true of some of the model uses seen in “agile” approaches.

So perhaps there is a need, in the diagram shown on that blog, to also have a model-based development (MBD?) circle that would intersect with MDD, but not the others?

All this also can not be discussed without mentioning the standards, processes, and methods (and the effect of tools on these) surrounding these approaches. Models need to have a standard representation to be useful – and the UML (and SysML) is certainly one that is common these days. However, other notations such as BPMN, ERD, etc., should not be discounted as they represent interesting domain specific modeling languages – and not all can be easily expressed using UML . Tools are too often viewed as a panacea to what ails software development – when they can be a hindrance when one does not understand the standards, processes, and methods they support.

Blogging from iPhone

I found myself looking at apps for the iPhone, and I found one that enabled me to post blog entries over the air. Of course, I had to try it out – and this is it!

I don’t know how flexible it is, or whether I need to enter HTML tags for line breaks. And the keyboard, although still usable, is still slower than a real hardware keyboard. Still, a bit painful…and no apparent integration with Safari.

What do you think? Is blogging from a phone, even the mighty iPhone, a useful thing?

Re: IBM digs in with Eclipse for weapons | Reg Developer

Well, it seems that someone at Reg Developer (IBM digs in with Eclipse for weapons) has seen the announcement regarding the new Systems Tooling announcement I blogged about earlier this week.

There is a bit of sensationalism in there. Granted that these tools can be used to develop weapon systems, they are also used in many other industries not so bent on destruction. I know, the announcement did seem to highlight aerospace and defense systems. And UPDM is based on DoD and MOD standards. But even UPDM is now much more of an Enterprise Architecture tool than one specifically dedicated to the military. This may seem a bit apologetic, but I hope it is not. I was in and I have worked with the military. I just think it would be a disservice to the technology to pigeon-hole it into just that domain when it could apply to much more.

Finally, the EU investigation into IBM’s intent to acquire Telelogic has not been delayed indefinitely, as the Reg Developer posting indicates. The EU has now set a new target date of March 19, 2008 for the completion of the enquiry.