The pie chart below shows the results of a survey of the causes of poor learning outcomes in schools in a particular country in 2011. Summarise the information by selecting and reporting the main features, and make comparisons where relevant. You should write at least 150 words.

The pie chart illustrates the findings of a survey conducted in 2011, detailing the various factors contributing to unsatisfactory learning outcomes within schools in an unspecified country. Overall, the data reveals that unskilled teachers were the most significant factor, while inadequate facilities and insufficient revision played the least prominent roles in the observed poor learning […]