The given diagrams illustrates some alters in construction of secondary school at west park between 1950 and 2010. Overall, science block cannot be seen in 1950,however, in 1980 and 30 years later, 2010, the block is easily noticeable.
According to the graph, houses have been omitted in 1980 and it is devoted to car park which was not available in 1950. It is noteworthy that in 2010 the car park is more spacious due in part to limitation of sports field and play ground.
In 1950, there is a farmland which is about 25 percent of the map, and it changed to sports field after 30 years and in 2010 the size changed to half.
Size and location of main building remained fairly stable(on the right side of the map) and does not meet any changes during the mentioned years.