Band 9: The charts below illustrate the global market share of three computer operating systems (OS) compared to other systems from 2012 to 2015. Provide an overview of the information by identifying and describing the key details, and include comparisons where appropriate.

The pie charts compare the market shares of different computer operating systems (OS) on a global scale from 2012 to 2015.

Overall, there were significant changes in the market shares, with OS 1 experiencing the most significant growth to become the most widely used. As a result, the collective share of other unspecified operating systems declined considerably, while OS 2 and OS 3 maintained relatively stable positions throughout the period.

Regarding OS 1 and other types of OSs, in 2012, other operating systems had almost half of the market, with a combined 48% share of the market, whereas OS 1 accounted for a lower proportion, at one-fifth of the global market. Over the next three years, the latter’s market presence grew rapidly, reaching 52% by 2015. There was a corresponding fall in the use of other OSs, as they ended up with 15% of the market.

As for OS 2 and OS 3, the former remained almost unchanged at 16-17% throughout, and the latter ranged between 10% and 15%, starting and ending at the latter level.