Here is another example of a question with no trend. This graph shows the energy use of a number of household appliances/activities:
We see that the data here was put together in 2010 i.e. it covers a single year but there is no time scale at all. This means there are NO TRENDS in the data and we must group by size.
The simple rule to follow is to see what groups does the data fall into and we will usually look for high, medium and low but this is not guaranteed – it depends totally on the data. Here it is most logical to use 3 groups:
High: (3 times higher more than any other single item at 42%)
Space heating and cooling
Medium: (around 12%)
Low: (each around 5% or less)
Remember that the best way to reduce the length of the response is to give average figures where the data allows us to do this instead of giving every figure separately.
A possible over statement might be:
“Overall, space heating and cooling is responsible for the highest amount of energy use while other appliances, water heating and lighting consume far lower levels of energy. In addition, the data also shows that all other areas of energy use shown each use a very low amount of energy.”
A very important note with this question is that this is real data, it has not been simplified for an examination which is why there are so many items in the pie charts. If you look at the Cambridge IELTS books at past exams, you will know that it is not normal to see so many items in a real test question. Nevertheless, even though the chart has many entries, it is not very difficult o describe it.
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(Data source: http://simsgreenenergy.com/services/)