 Okay, we're going to move swiftly on and I'd like to invite Claudia to come back to the next topic on the list in planning and knowledge as a framework for planning. Thank you. Good morning to everyone, especially to be here after the party. And first of all, I would like to thank you, the organiser of the session to give us the opportunity to talk of this very interesting subject and I'm glad to listen to your presentation because it's in language with what you're thinking about. Okay, that works. What is it? Okay. I'm talking about Aosta. Aosta is an historical city located in the Valida Aosta region, nearly the Mont Blanc and between France, Switzerland and the region of Piemonte. The archaeological records in this city covers a long period from the fifth millennium before Christ through the proto-historic periods until the foundation of the Roman colony of Augusta Pretoria. Obviously not forgetting a long traditional of the medieval times as you can see from all the symbols in the distributional map. For this reason cultural heritage bodies that are in the lenses have created what you see on this plan, the areas of archaeological interest to control modern developments inside the limits of the Roman city, see on the right. Along the main roads that are from the north, in the north and in the west in this plan and where the excavation recognized archaeological sites in the past. But in the last decade fortunately we have the possibility to follow some major development projects. The first one for example for the enlargement of the hospital, we are talking in another session about this. The Destafaki project for the enlargement, the new construction of the university and also some large archaeological projects have been undertaken and some are still going on in the city and outside the city. But we are focusing now in a project, in the tertia project which you see in red in this plan that was a project for the creation of the new central heating system of the city that has involved the western and northern parts of the outside part of the city, sorry outside the Roman walls. In this contribution we'll focus on this. Respecting the needs of preventive archaeology, this project was preceded by an assessment study and the map with different levels of archaeological grease was supplied to the developers and also to the Soviet peninsula. A continuous archaeological assistance was undertaken during the course of the new pipelines. I put evidence on the fact that the plan that you see in this picture is made mostly on positive data sense because the old archaeological documentation for us with no result is always totally absent. There's nothing about it. And unfortunately also the positive data, sometimes the levels and the location of the pipelines are not really well recorded so we can't use them or we know where they are around but not exactly the position, especially the level from the surface. This project therefore was a real occasion to organise all this data in this part of the city. That's all, as you see, it's all a modern city now so it's not a free landscape. The images of the two metres wide trenches around the city of the Tarsha project, the total length until now is of about five kilometres but the project is still going on. And here in this lab some of the archaeological finds so we have burials, structures, roads and on the right also an iron age tumours that unfortunately we couldn't dig because it was in the middle of one of the main streets of the city. That's normal. The length, as you see, represents only the four percent of the total investigative studies. So we have 96% of blank areas and obviously composed of blank sections or rather sections with layers commonly identified as of no archaeological interest and so usually not documented. So what we have done, we had to follow these trenches. We didn't want to waste our time obviously. The project, we analysed and documented many of these sections in order to follow the transformation of an ancient landscape during the main archaeological periods. And here is an idea of what we found. Every section, obviously some samples of sections, have been analysed not only from an archaeological point of view but also for the typology of terrain, for example, the Moranic area, the Delta area with its alluvial deposits and its very natural channels and also for the presence or absence of cultivated fields. All this data were geo-referenced in section and in plan to help to reconstruct the areas of real absence of data. We are extremely fortunate in Aosta because the Roman levels are always clearly recognisable for the country content, even in the suburb, giving us effectively a great baseline as you see in red in these sections. Then we analysed the different data, put it together about the positive and the negative information. We were able to create a digital terrain model and upon this we reconstructed the ancient land use of the different areas. Here you see the protostoric and Roman's face as an example with all the finds, the dots and the signs of the finds that we already knew before and after this project obviously. The first result of this approach using negative data sets is that at the end of the process we can now delimit the areas of geological interest in this part of the city in a much more effective way than before. In developing this idea we added the so-called cantina or cellar salve to analyse areas where modern building had destroyed completely the geological deposits. So in this plan you see in white the zone of real no risk, totally destroyed by modern constructions. And going further we used the important guideline of the depths of Roman deposit beneath the Roman surface. A surface that nowadays is quite horizontally but in the past was very differently obviously. And with the GIS system and some stratigraphy, some statistical system we recreate the plan that you see on the top left. And we mixed the two plans. In conclusion, now to this we can overlay every type of plan of every new development project in a more accurate way obviously. In conclusion, using the information of blank areas we have created a very important tool to control and preserve the archaeological deposits. And that in the data of land used for every period we can also decide where we want to do a better control in order to answer specific archaeological questions for every period if a proposed development project crosses these areas. But our problem is to do this we need to impose a certain standard archaeological documentation of blank areas. We have highly motivated archaeologists in our trenches but from the point of view of our company the job is time consuming and not well paid. So our question is how can we simplify the data collection process without reducing quality? Maybe creating a minimal standard checklist for question and answer sheets for archaeologists who encounters blank areas during everyday work following the trenches required by preventive archaeology. Doing this, all these negative data sets can become a great instrument for future planning and also good value for money. Thank you.