Summary. A 40‐item chemistry‐based ‘cognitive preference test’ was developed and administered to 284 students subsequent to their study of O‐level chemistry, in an attempt to identify preferred modes of attending to scientific subject matter. The results allow two major cognitive styles scales to be formulated: the first measures students' ‘scientific curiosity,’ i.e., their willingness to extend their knowledge of chemistry beyond existing confines; the second scale measures students' orientation towards the ‘pure’ or ‘applied’ science side. Cognitive styles were found to vary considerably with academic ability in chemistry: high achievers are strongly inclined towards further learning of the subject and oriented towards the ‘pure’ science domain. Low achievers display the reverse characteristics.

Using a mixed‐methods approach, this article evaluates the equity implications of Zimbabwe's presumptive tax system, introduced in 2005 to raise revenue from the country's growing informal sector. The representative taxpayer method, which compares the hypothetical tax burdens of formal and informal sector taxpayers at varying income levels, shows that the presumptive tax regime undermines both vertical and horizontal equity. In addition, interviews with key informants from the tax authorities, other relevant organizations and informal sector operators were conducted to probe issues around collection, compliance and perceptions of fairness. The qualitative data suggest that weak enforcement, with more visible informal activities bearing the brunt of the tax burden, and selective (and sometimes politically motivated) application of the legislation, compromise equity further.

SUMMARY Governments have to raise revenue to finance public goods. This study analyses the challenges that Zimbabwe, like most developing countries, faces in attempting to collect taxes from its informal sector. Because the so‐called informal sector forms a large and sometimes growing component of the economy, collecting sufficient revenues to fund expenditure requires tax authorities to seek ways to collect revenues from those earning their incomes in the informal sector. There has been an attempt to collect taxes from the informal sector in Zimbabwe over the past 8 years. Although the actual amount collected from this sector has increased, an evaluation of the way taxes are administered needs to go beyond the amount of revenue collected. It needs to also look at issues such as the proportion of the informal sector paying these taxes, the amount collected as a proportion of total revenues, the costs incurred in collecting these taxes and the tax administration's ability to encourage quasi‐voluntary compliance. This study indicates that the levels of evasion (confirmed by the informal sector associations themselves), selective application of tax regulations and corruption are alarmingly high. These factors, together with the very high tax rates and sheer ignorance, operate as a serious disincentive in informal sector tax compliance resulting in very low revenues from this sector. Copyright © 2014 John Wiley & Sons, Ltd.

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