Building BridgesI have often used the analogy of building a bridge to explain to business colleagues the difference between Rapid Application Development (RAD) and Waterfall.Let’s say that we are in the middle ages and the Mayor of Kingston-upon-Thames is evaluating whether or not to build a bridge over the river to the north side, to replace the current ferry. The whole area has been growing rapidly and a bridge at Kingston should give his town a lead against competing local towns like Ham and Richmond (who also have their own ferries).However, building a bridge presents problems. Firstly, the bedrock north and south of the river are very different. Secondly, the river is still tidal at this point and its path continues to vary across the floodplain. Finally – and perhaps most importantly – there is no guarantee that the projected growth in cross-river traffic will indeed materialise – or that people will wish to cross at this precise point, rather than further up, or down, river. A new bridge could prove an expensive white elephant and divert much-needed town resources away from other projects. The increased local taxes required could also scare the very businesses he is hoping to attract… Read full this story
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