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In addition, a number of other error sources are sometimes used within the framework of the ISCWSA model, such as Wolff and deWardt [8] terms and terms for other historic survey tools. Doing this is not exactly the same as implementing the Wolff and deWardt model as detailed in their paper, but is rather a halfway house between the two error models which may agree for some situations and may give very different answers in other circumstances. No attempt has been made in this document to list any non-ISCWSA standard error sources. It has been recognised that a great deal of time can be lost when checking and migrating survey databases from one system to another and trying to map across historic survey tools. It is hoped in future that it may be possible to agree on some generic toolset to minimise these problems.
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