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The eight tasks in an artefact lifecycle

full image at http://www.sumsol.co.uk/schema.pdf

A bridge, building, or piece of software may exist for many years. Or, as often happens in the case of new software, be scrapped before it is put into use. My mate Wayne, a professional software developer for over 12 years, has worked on several projects which were canned before they were completed. In a world of ever changing requirements and circumstances, ‘it’s not unusual’ as Tom Jones would say. Software development can take months, even years of effort, so scrapping the results is a waste. To counteract this, we have libraries for software reuse, design patterns and templates to avoid reinventing the wheel.

But why just reuse the product template or pattern? Why not template the tasks the artefact underwent during its lifecycle? By extending the theory of function, structure, and behaviour, there are eight tasks in an artefact lifecycle. Continue reading “The eight tasks in an artefact lifecycle”

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Design using function, behaviour, structure

English Heritage pic of Rievaulx Abbey
Last month, at the Architectural Association, Bill Hillier described how English Heritage often want to reinstate the paths and roads of the historic sites they are trying to preserve. Hillier argued that these sites need new pathways as the way people interact with them now is not the same as when they were built. One example of this is Rievaulx Abbey. It was once a place where monks lived and worshipped, until Henry VIII dissolved the monastries to get his hands on their money.

Today, Rievaulx is a tourist attraction, which is occasionally used as a place of worship and the change in its functionality is reflected in the pathways around it. They can be described as paths of desire, which have come about because visitors wander across the grass or clamber over a wall to get to a specific part of the abbey instead of walking about retracing the routes the Cistercians may have used, which would give visitors a better insight into the way the abbey and its inhabitants behaved. Continue reading “Design using function, behaviour, structure”

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Using patterns to shape our world

Escher picture

In the 1990s, Erich Gamma changed the way I thought about software engineering forever! Gamma visited the Ecole Polytechnique Federale de Lausanne where I was a PhD student, in order to give a seminar on design patterns.

The idea of extracting a solution template from a piece of software to turn it into a pattern which can be reused, was to me, an exciting step forward in software engineering. Instead of reusing software from a library that needs to be maintained and ported as necessary, abstracting the solution and creating a pattern repository gives software engineers a toolbox of meta-level solutions.

Continue reading “Using patterns to shape our world”

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Stalkers in space and Facebook in your face

Facebook screenshot

I created my first webpage in 1995, which has since disappeared forever as even www.archive.org thinks it’s too old to store. Fingers poised over my keyboard, I felt shy about what to write. Eventually, I restricted myself to my research interests as I didn’t think that anyone would care to know about my favourite beer. How times have changed. The web nowadays is full of people talking about their favourite beers (mine, by the way, are Theakston’s Old Peculiar and Franziskaner). Everyone likes to chat. Continue reading “Stalkers in space and Facebook in your face”