The Evolution of Information Technology is rapid. Electronic circuits substitute mental activities and new Technology invades to all aspects of life. Nursing, which is like all the other Health related professions information-intensive, could use the new Technology to be facilitated. The implementation of Informatics to Nursing was supported by the growing information that Nursing has to manage. The definition of Nursing Informatics was put on 1980 and since then a lot attempts to define Nursing Informatics have followed. The applications of Nursing Informatics are focused on four fields of Nursing: Administration of Nursing, Clinical Practice, Education, and Research. The first applications of Nursing Informatics made visible the need for the development of a Unified Language System. The efforts, today, are focused on two fields:

• to establish a standard definition of the terms of or related to Nursing Informatics

• to establish standard definitions and Classification Schemes for the Nursing Phenomena and Practice so that they can be processed by Nursing Informatics

In solving these problems important role plays the study of Linguistics. Another important factor that should be taken into account is the Development of International Standards of general acceptance that enhances communication aspects. Apart from the International Standardisation Organisations, other non-profit organisations have constituted Special Groups that are dealing with the promotion of Nursing Informatics. Final Nursing Informatics should follow the previous attempts of Nursing to establish a Unified Language System. All the steps of the development of the application are described. In particular subjects that are covered are: the scope of the application, the collection of the material, the designing and building up of the Database, the development of a User Interface and the characteristics of the Application.