Camera traps provide a robust alternative to direct observations for constructing social networks of wild chimpanzees

Social network analysis provides valuable opportunities to quantify the nature of social relationships in animal societies including aspects of group structure, dynamics and behaviour transmission. Remote monitoring approaches such as camera trapping offer rich data sets from groups and species that are difficult to observe, yet the robustness of these data for constructing social networks remains unexplored. Here we compared networks of party association based on camera traps with those based on direct observations over the same 9-month sampling period in a group of habituated western chimpanzees, Pan troglodytes verus. Networks based on camera traps and direct observations were both stable with sufficient sampling, and had very similar structures, patterns of sex assortment and individual network positions. However, camera trap data led to lower estimates of group density and dyadic association strengths, and slightly higher modularity, illustrating the limitations raised by differences in data collection methods for network comparisons. We then constructed a social network using camera trap data from unhabituated eastern chimpanzees, P.t. schweinfurthii, demonstrating the feasibility of this approach in the absence of extensive prior knowledge of the study subjects. Further, differences between the eastern and western chimpanzee social networks followed expected patterns based on recognized social differences, illustrating the promise of this approach for detecting within-species social variation. Although long-term behavioural observations will continue to provide rich data for many species, camera traps offer a powerful alternative to gain information on social group dynamics in elusive or unhabituated animals, as well as to conduct systematic multisite comparative studies

Gamified Requirements Engineering: Model and Experimentation

[Context & Motivation] Engaging stakeholders in requirements engineering (RE) influences the quality of the requirements and ultimately of the system to-be. Unfortunately, stakeholder engagement is often insufficient, leading to too few, low-quality requirements. [Question/problem] We aim to evaluate the effectiveness of gamification to improve stakeholder engagement and ultimately performance in RE. We focus on agile requirements that are expressed as user stories and acceptance tests. [Principal ideas/results] We develop the gamified requirements engineering model (GREM) that relates gamification, stakeholder engagement, and RE performance. To evaluate GREM, we build an online gamified platform for requirements elicitation, and we report on a rigorous controlled experiment where two independent teams elicited requirements for the same system with and without gamification. The findings show that the performance of the treatment group is significantly higher, and their requirements are more numerous, have higher quality, and are more creative. [Contribution] The GREM model paves the way for further work in gamified RE. Our evaluation provides promising initial empirical insights, and leads us to the hypothesis that competitive game elements are advantageous for RE elicitation, while social game elements are favorable for RE phases where cooperation is demanded

Assessing the severity of challenging behaviour: psychometric properties of the challenging behaviour interview.

Background The Challenging Behaviour Interview (CBI) was developed as an assessment of the severity of challenging behaviour. The CBI is divided into two parts. Part I of the interview identifies the occurrence of five clearly operationalized forms of challenging behaviour that have occurred in the last month. Part II of the interview assesses the severity of the behaviours identified on 14 scales measuring the frequency and duration of episodes, effects on the individual and others and the management strategies used by carers. In this paper we report upon its psychometric properties and discuss potential clinical and research uses of the new scale. Methods The CBI was administered to 40 adults and 47 children. Test–retest and inter-rater agreement was assessed for 22 participants in the adult sample. Concurrent validity was assessed by correlating total scores for the child sample with the subscale and total scores of the Aberrant Behavior Checklist (ABC). Content validity was assessed by comparing scores for each behaviour on specific items relating to relevant aspects of severity of impact that would be expected to differ based upon the topographies of the behaviour. Results Mean inter-rater and test–retest reliability kappa indices for the behaviours in Part I of the interview were 0.67 (range: 0.50–0.80) and 0.86 (range: 0.70–0.91), respectively. Mean inter-rater and test–retest reliability Pearson‘s correlation indices for the behaviours in Part II of the interview were 0.48 (range: 0.02–0.77) and 0.76 (range: 0.66–0.85), respectively. Correlations with the ABC varied between 0.19 and 0.68. The majority of content validity comparisons were in line with prediction. Conclusions The potential of the interview for clinical assessment, as an outcome measure for services and individual interventions and research purposes, is discussed