Validation of datasets. Information is required about all data used for GIS purposes. Comparison of datasets is a powerful function of GIS but it is important to understand the standards used for the primary data collection e.g. place-name, object types. GIS can be used as a tool to assist validation as it gives the visual key to data which can easily slip by unnoticed in a database. The scale of data capture influences the accuracy of analysis and display.
User expectations are high.
It always takes a while to get a GIS operating to meet specific needs. It requires involvement and commitment from the users. GIS can have a 'Rollercoaster' effect and once the technology is embraced it is easy to see very many further developments and data-sources which are desirable. Existing databases can be made to work with the GIS and there are many available data-sources which can be imported, so that not everything has to be captured from scratch. The GIS can thus be put to good use very quickly if this is the case and data can take on a new dimension as it is used in conjunction with other layers.