21.   Purely descriptive studies serve as the raw data for those comparative studies that aspire to higher levels of explanation.

22.   Task lighting usually entails higher levels of illumination needed for reading and other close work.

23.   The company had more titles at higher levels than did other publishers.

24.   The increased use of independent learning at higher levels within the pathway is reflected in the assessment pattern within the modules.

25.   The management seems to expect staff to be constantly achieving higher levels of efficiency and productivity.

26.   There are not many part-time workers in the middle and higher levels of management.

27.   There is evidence that higher levels within organisations have an important influence on workplace personnel and industrial relations practices.

28.   These students have a higher level of mathematical ability.