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Message from discussion UML state chart diagram question
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H. S. Lahman  
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 More options Mar 31 2012, 10:21 am
From: "H. S. Lahman" <h.lah...@verizon.net>
Date: Sat, 31 Mar 2012 10:21:31 -0400
Local: Sat, Mar 31 2012 10:21 am
Subject: Re: [UML Forum] UML state chart diagram question
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Responding to Mercer-Hursh...

>>  Software design is difficult enough without second guessing
>>  well-established paradigms, methodologies, and good practices on a
>>  case-by-case basis.

> I might timorously suggest that there is a big difference between:

> 1. Stating that something is a rule that one will always follow, but
> one day finding oneself with a problem that one can't figure out how
> to solve while following the rule and so deciding, just this once, to
> violate it, but taking this as a personal failing because one didn't
> figure out how to do it right.

Right. No methodology is perfect and eventually one encounters corners
where it simply doesn't work in a reasonable way. While the
methodologies are not perfect, they have evolved to the point where such
situations are quite rare.

> and

> 2. Stating from the beginning that something is a rule except for some
> cases when it is not.

> The former is going to have one trying very hard to observe the rule.  
> The latter is going to have one deciding that this is one of the
> exceptions every time things get even slightly tough.

This is the one I have a problem with. It allows a host of motivations,
like elegance and saving keystrokes, to drive the design. Worse, it
allows converts to the OO paradigm to map antithetical principles onto
the paradigm. IOW, it invites bad OOA/D habits.

--
Life is the only flaw in an otherwise perfect nonexistence
    -- Schopenhauer

Rene Descartes went into a bar. The bartender asked if he would like a drink. Descartes said, "I think not," and disappeared.

H. S. Lahman
H.lah...@verizon.net
software blog: http://pathfinderpeople.blogs.com/hslahman/index.html


 
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