The discussion in Chapter Four highlighted that establishing relationships between local authorities and housebuilding companies should be seen as a prime objective of enabling authority’s housing strategies, yet this is only part of the process. To ensure that the local authority has an adequate understanding of the housing market, it will have to make use of available information sources, monitoring data and using this data to make evaluations of the housing market. This chapter will discuss the work that has attempted to examine data sets that may be employed by local authorities, which will lead into Chapter Six, an examination of the data that local authorities actually monitored in the mid-1990s.