Anthropometric Data

Once you have identified the functional elements, and the relative importance of such elements, it should be your endeavor to fix the sizes for such elements so that the different geometric figures which have been worked out for different elements can be juxtaposed appropriately. 

For fixing the of such elements you have to take the help of anthropometric data which gives the sizes of or standard measurements of postures of human movements. For example, Annexure - IIA gives body measurements in different postures of human movement, whereas Annexure - IIB presents the table sizes for good standard of a restaurant. Likewise, you will have to study or find out the sizes of different items of furniture that you may like to put in the functional spaces. 

With the help of anthropometric data for various space requirements and sizes and shapes of furniture, you will be able to find out the minimum sizes that are required for the functional elements and evolve a definite geometric shape (preferable square or rectangle) for such elements. 

Broad Classification of Components of Buildings 

The space within a building can be broadly divided into three parts : 

1. Functional space : bed room in a residential building, dining hall in a restaurant or class room in an educational building. 
2. Circulation space : corridor in an educational building, hospital or hotel; lobby in a school. 
3. Service space : toilets and kitchen in a habitable building, pump room, air-conditioning plant room or laundry in hotels and hospitals etc. 

In order to achieve a most cost effective planning, your endeavour should be to evolve a most compact  form of a Guilding in which the circulation space is minimum. Once the referent functional aspects of the building are known, the utilitarian planning will be to arrange the different functional spaces in a compact, neat and least costly form in which superfluous corridors etc. have been avoided, and a pleasing form obtained. 

Pre-conception 

Pre-conceived forms for any building should be avoided. It is always better to adjust the requirements (geometric shapes that have already been evolved) to obtain a suitable form of the building. To summarise, we may say that form follows function.