## 5 Conclusions  
The paper dealt with the evaluation of cockpit ergonomics impact on workload and psychophysiological response to ad-hoc change in display of flight, navigation and engine data, with respect to performance assessment. Workload was assessed by means of monitoring heart rhythm variability, which reflects the level of autonomic nervous system involvement in reaction to a stressor. The presented study is fitted in the domain of general aviation. It recognized sudden change in the display of flight data during a training as a potential stressor, or at least a factor contributing to increased workload. The results, however, show that such change may not be considered as a factor influencing workload. On the other hand, such a change of cockpit ergonomy could lead to performance decrease, therefore transition between analog and glass-cockpit should be considered as performance influencing factor. The results also indicate that higher stress may not lead to performance degradation (in the case of this study to a change of piloting precision). The primary factors influencing the monitored sample of pilot subjects seem to be acquisition of piloting habits and familiarization with the cockpit representation by additional training. In case of the presented study, additional training that may significantly contribute to performance improvement, should include simulated training of 4-5 flight hours. Obviously, it would be useful to research detailed trends during such trainings, which is absent in the presented paper. The study was carried with a sample of 20 participants with no previous experience with flying. By this, among other measures, the objective was to ensure research sample uniformity. Despite the efforts, this was not achieved as is shown by the inter-individual and inter-group variability. The research sample size may also have manifested in the inability to determine statistically significant differences in the measurements, especially for monitored HRV parameters. This fact can be considered the main limitation of the presented study. It is important to add, however, that the presented study is the first of its kind, which attempted to take an experimental attitude, with an approach close the real training. This approach is expensive and time-demanding, which was the main reason for not including more subjects. As another limitation we consider data collection about piloting precision, which can be considered subjective. In this case, we rely on the instructor's ethics, for whom such evaluation is a daily job. As already mentioned in the previous sections, the problem with exact evaluation of piloting precision lay with the inability to obtain flight recorder data from aircraft equipped with analogue cockpit. If these data were available, it would be possible to precisely evaluate all manoeuvres for piloting precision and correctness, or evaluate the whole flights against physiological parameters. We believe, however, that these limitations are minor considering the presented results, and that the study results present valuable contribution not only to the aviation domain. For further research it would be interesting to collect other physiological parameters as well, such as EEG, respiratory curve, etc. Such collection should, however, be realized so that the applied devices do not limit the pilot in his or her activity, and influence the experimental setup. Currently it is possible to extend such measurements with subjective evaluation by means of structured questionnaires, which would provide information about subjective perception of performance and workload. This information could serve the comparison with objective evaluation methods. Interesting appears also the use of eye-tracking, which could help better understanding of attention distribution during the transition to other types of ergonomy cockpit. In this case, however, a wearable technology shall be used with implemented eye-tracking and camera system recording the environment, for its embedding into the scene view.