This article describes the processes and objectives of qualitative longitudinal analysis in evaluation research, using a recent evaluation study – the evaluation of the Job Retention and Rehabilitation Pilot – as an example. It describes evaluation research as involving an interplay between four domains of change: individual, service, policy and structural, which makes longitudinal qualitative research a particularly rich data source. It outlines different types of change that may be evident: narrative change, reinterpretation by either participant or researcher, and the absence of change. The article describes how the Framework analysis method was used to analyse longitudinal qualitative research. It examines how the data can be read in different ways to combine cross-sectional and longitudinal analysis, and theme, case and group analysis, and discusses the kind of questions that can be asked of change in longitudinal qualitative evaluation studies.

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SUMMARY Temperature is an important factor influencing the biology of ectothermic organisms and is intrinsically linked to climate change. Trematodes are potentially susceptible to temperature changes and in order to develop predictive frameworks of their responses to climate change large-scale analyses are needed. The present study, using the Q 10 value, analyses experimental data from the scientific literature on the effects of temperature on cercarial development and emergence across a wide range of temperature in low (⩽35°) and mid-latitude (36-60°) species. Temperature appears to have no significant effect on the rate of development of cercariae within molluscan hosts. Data on cercarial emergence, corrected to incorporate the minimum emergence temperature threshold (METT) and acclimation status, was found to be largely unaffected by temperature over optimum ranges of ≈20 °C (15-25 °C) for mid-latitude species and ≈25 °C (20-30 °C) for low-latitude species. In addition, a decline in emergence rates was shown at higher temperatures. These results are contrary to a previous study on the meta-analysis of cercarial emergence. Some evidence of strain-specific differences and thermostability over a wide temperature range for both cercarial development and emergence was apparent. The significance of these results in furthering our understanding of cercarial biology under natural conditions is discussed.

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