In the later part of 1999, a relational Microsoft Access database was created to accommodate a wide range of data on the phytoplankton Karenia brevis. This database, termed HAB Historical Database (HHD), was designed to efficiently capture core information, yet have the capacity to expand and capture related sampling information if it is available. It performs this task through a series of connected data tables and related forms. The minimum parameters required in order for a sample record to be entered into the database are a K. brevis count (in cells per liter), the date when the water sample was collected, and a description of where the water sample was taken. Datasheets that contained these minimum requirements were compiled from various investigative cruise projects, and state, county, and private agencies, which had collected samples that contained K. brevis. These datasheets varied greatly in specificity of information from the minimum required parameters to detailed cruise and research studies. Due to this diversity, it was decided to incorporate as many entry fields as possible for related information from the datasheet.