Procedure for the maintenance of at least one of a number of field devices in an automation technology system, said procedure comprising the following steps: - Recording of at least one process point of the system in a database; - Assignment of a process application to the process point in the database; - Recording of device types assigned to the process point among the variety of field devices and saving of the device types in the database; - Recording of diagnostic messages (D 1, D 2, D 3, D 4, D 5, D 6) of the variety of field devices, assignment of the diagnostic messages (D 1, D 2, D 3, D 4, D 5, D 6) to the individual device types and saving of the diagnostic messages (D 1, D 2, D 3, D 4, D 5, D 6) in the database; - Creation of error patterns from the saved diagnostic messages (D 1, D 2, D 3, D 4, D 5, D 6), which represent a correlation of different diagnostic messages (D 1, D 2, D 3, D 4, D 5, D 6) among the messages saved in relation to an error that occurred, and saving of the error patterns in the database; - Taking of applied measures (M 1, M 2, M 3) to rectify the error that occurred, assignment of the applied measures (M 1, M 2, M 3) to the various error patterns and saving of the applied measures in the database; - Creation of performance evaluations for the individual saved applied measures (M 1, M 2, M 3), wherein a performance evaluation is an indicator of the efficiency of the saved applied measure (M 1, M 2, M 3); - In the event of the occurrence of a new diagnostic message (D x) coming from at least one of the variety of field devices, a comparison is run against the error patterns saved in the database and a suggestion is displayed, indicating at least one measure (M x) to suit the error, as is a performance evaluation if one or more of the error patterns contain(s) the new diagnostic message (D x) that occurred. - Recording of at least one process point of the system in a database; - Assignment of a process application to the process point in the database; - Recording of device types assigned to the process point among the variety of field devices and saving of the device types in the database; - Recording of diagnostic messages (D 1, D 2, D 3, D 4, D 5, D 6) of the variety of field devices, assignment of the diagnostic messages (D 1, D 2, D 3, D 4, D 5, D 6) to the individual device types and saving of the diagnostic messages (D 1, D 2, D 3, D 4, D 5, D 6) in the database; - Creation of error patterns from the saved diagnostic messages (D 1, D 2, D 3, D 4, D 5, D 6), which represent a correlation of different diagnostic messages (D 1, D 2, D 3, D 4, D 5, D 6) among the messages saved in relation to an error that occurred, and saving of the error patterns in the database; - Taking of applied measures (M 1, M 2, M 3) to rectify the error that occurred, assignment of the applied measures (M 1, M 2, M 3) to the various error patterns and saving of the applied measures in the database; - Creation of performance evaluations for the individual saved applied measures (M 1, M 2, M 3), wherein a performance evaluation is an indicator of the efficiency of the saved applied measure (M 1, M 2, M 3); - In the event of the occurrence of a new diagnostic message (D x) coming from at least one of the variety of field devices, a comparison is run against the error patterns saved in the database and a suggestion is displayed, indicating at least one measure (M x) to suit the error, as is a performance evaluation if one or more of the error patterns contain(s) the new diagnostic message (D x) that occurred.