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The need of town planning tools with time sensitive aspectsCities and fragments of cities are constantly growing over the centuries and have in the past accommodated usually slowly to new requirements, besides destruction by force from outside. The present situation of a city can be fully understood only by depicting comprehensibly it's history and development. In modern planning often the sensitive and prospective dealing with the existing city is poorly taken into account, which leads to huge disadvantageous changes of city structures. There is a lack of a tool that continuously supports the past, present and future of buildings and enables planning teams to view the object of the planning in its chronological correlation.Also annotation, indexing and retrieval of digitized historical material as plans and written documents help to deal with historic sources. The possibility to built up an digital archive of historic material serves as a documentation for future pur-poses. The visualization of the historic and contemporary dimension of cultural, social and political context aids to make appropriate planning decisions. The growing complexity of questions in urban planning processes leads to interdisciplinary planning teams and therefore more and more defined working structures. In order to create a comfortable working environment and user interface which allows experts and non-experts to have a more professional and more intensive dialogue. Basis of the planning toolThe basis of the implemented tool is the linkage of geometrical objects with semantic information in a CAD environment. Most important is the indication of the buildings lifespan. Besides the year of construction of a building and its demolishion date, information about any conversions can be filed. Along with that any information that can be gathered about the city fragment and its buildings 296 eCAADe 20 [design e-ducation] Information Processes in Design. Session 7 Turban Time sensitive modelling of cities and urban fragments in CAD environments