ABSTRACT. We present a unified approach to a complex of related issues in control theory, one based to a great extent on the methods of nonsmootb analysis. The issues include invariance, stability, equilibria, monotonicity, the Hamilton-Jacobi equation, feedback synthesis, and necessary condtions.

‘Capacity development’ implies a promise of growing self‐reliance, national ownership and sustainability, yet practice seems consistently to fall short of this emancipatory promise. This introduction argues for a reframing of capacity development for emancipatory social change. Articles in this IDS Bulletin show how understanding and practice must engage with complexity, appreciate the importance of specific culture and context, and continually address the role of power in shaping relationships, understandings and practices. Values and leadership are fundamental drivers of capacity development processes. This IDS Bulletin argues against a deficit approach based on linear causal logic and replicable ‘best practice’. Instead, practitioners are encouraged to develop a detailed understanding of the culture and dynamics of specific contexts, to detect energies for positive change and work to connect and facilitate them. Learning is at the centre of the approach. Capacity development is understood as a collective process of learning in action for social change. Support for capacity development processes demands a critical development practice that implies mutual learning, with an emphasis on reflective and experiential approaches. However, this reframing implies enormous challenges for development practice, and therefore considerable personal and organisational commitment.

ObjectiveWe built an app to help clients of food pantries. The app offers vegetable-based recipes, food tips and no-cost strategies for making mealtimes healthier and for bargain-conscious grocery shopping, among other themes. Users customize materials to meet their own preferences. The app, available in English and Spanish, has been tested in a randomized field trial.DesignA randomized controlled trial with repeated measures across 10 weeks.SettingClients of fifteen community food pantry distributions in Los Angeles County, USA.ParticipantsDistributions were randomized to control and experimental conditions, and 289 household cooks and one of their 9–14-year-old children were enrolled as participants. Experimental dyads were given a smartphone with our app and a phone use-plan, then trained to use the app. ‘Test vegetables’ were added to the foods that both control and experimental participants received at their pantries.ResultsAfter 3–4 weeks of additional ‘test vegetables’, cooks at experimental pantries had made 38 % more preparations with these items than control cooks (P = 0·03). Ten weeks following baseline, experimental pantries also scored greater gains in using a wider assortment of vegetables than control pantries (P = 0·003). Use of the app increased between mid-experiment and final measurement (P = 0·0001).ConclusionsThe app appears to encourage household cooks to try new preparation methods and widen their incorporation of vegetables into family diets. Further research is needed to identify specific app features that contributed most to outcomes and to test ways in which to disseminate the app widely.

This study tested whether message tailoring of recipes and food-use tips for low-income households is superior to providing a generic version of the material. The field experiment was conducted in the busy conditions found at community food pantries, and included 10 food distributions at each of six sites. We analyzed the consumption of fresh vegetables 6 days following distributions, and retention of print materials 6 weeks later. Self-determination and reactance theories guided the development of tailoring in an indigenous fashion, allowing each pantry client to choose recipes and food tips thought personally useful. This contrasted against paternalistic tailoring, common in health communication, where a motivational theory is used to regulate the health messages given to recipients. Results demonstrated benefits of tailoring over both generic and control conditions and uncovered the degree of tailoring that produced the largest effects. As suggested by construal level theory, the intervention addressed recipients' immediate and concrete decisions about healthy eating, instead of distant or abstract goals like prevention of illnesses. We documented per-client costs of tailored information. Results also suggested that benefits from social capital at sites offering a health outreach may exceed the impact of message tailoring on outcomes of interest.

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