Evaluation of a Decision Case Approach to Food Biotechnology Education at the Secondary Level

Use of Decision Cases for Building SNAP-Ed Implementers' Capacities to Realize Policy, Systems, and Environmental Strategies

OBJECTIVE

To develop and validate decision cases as a capacity-building training tool for implementing policy, systems, and environmental (PSE) change strategies.

DESIGN

Study phases were: (1) in-depth interviews conducted repeatedly over a year with Supplemental Nutrition Assistance Program Education (SNAP-Ed) partner sites and once with SNAP-Ed implementers to identify dilemmas when implementing PSE change strategies; (2) decision cases developed to highlight dilemmas; and (3) focus groups with SNAP-Ed implementers to determine decision case utility as a capacity-building training tool.

SETTING

A southeastern state.

PARTICIPANTS

SNAP-Ed partner sites and implementers; Focus group participants.

INTERVENTION

Decision cases.

ANALYSIS

To establish content validity, a thematic analysis of interviews identified common dilemmas when implementing PSE change strategies. SNAP-Ed implementers' focus groups provided feedback to determine the utility and validity of decision cases developed from the analysis.

RESULTS

Common dilemmas of implementation of PSE change strategies reported by SNAP-Ed partner sites (n = 20) and implementers (n = 8) were lack of site and educator readiness and capacity; communication breakdowns; and prioritization of nutrition education over PSE implementation. Focus group participants (n = 8) reviewed a case and discussion guide and recommended them as a capacity-building tool for training.

CONCLUSIONS AND IMPLICATIONS

Using decision cases could help build SNAP-Ed implementers' capacities to implement nutrition PSE change strategies and strengthen partnerships.

A case-based approach increases student learning outcomes and comprehension of cellular respiration concepts

This study investigated student learning outcomes using a case-based approach focused on cellular respiration. Students who used the case study, relative to students who did not use the case study, exhibited a significantly greater learning gain, and demonstrated use of higher-order thinking skills. Preliminary data indicate that after engaging with the case study, students were more likely to answer a question addressing misconceptions about cellular respiration correctly when compared with students who did not use the case study. More rigorous testing is needed to fully elucidate whether case-based learning can effectively clarify student misconceptions related to biological processes.

Review and analysis of evaluation measures used in nutrition education intervention research

The purpose of this review is to provide a summary of the kinds of evaluation measures used in 265 nutrition education intervention studies conducted between 1980 and 1999 and an analysis of psychometric issues arising from such a review. The data are summarized in terms of tables for interventions with each of six key population groups: preschool children, school-aged children, adults, pregnant women and breast-feeding promotion, older adults, and inservice preparation of professionals and paraprofessionals. Measures evaluating knowledge and skills or behavioral capabilities were most widely used in studies with preschool, school-aged, and inservice populations (50%-85%) and less widely used in studies with the other groups, particularly breast-feeding promotion (5%). Measures of potential psychosocial mediators or correlates of behavior such as outcome expectancies, self-efficacy, or behavioral intention were used in 90% of behaviorally focused studies with school-aged children and in about 20% of studies with adults. Dietary intake measures were used in almost all studies, primarily food recalls, records, and quantitative food frequency questionnaires. Short frequency instruments involving only foods targeted in the intervention such as fruits and vegetables are increasingly being used. Measures of specific observable behaviors are also increasingly being used. Physiologic parameters were used in about 33% of behaviorally focused interventions with school-aged children and adults, 20% with older adults, and 65% with pregnant women and/or their infants. Criterion validity of newly developed intake instruments and content validity of instruments measuring mediating variables were reported in the majority (range 50%-90%) of studies. Reliability and stability of measures of mediating variables were reported in 50% to 75% of studies, with reliability coefficients mostly about .6 to .7. Two major conclusions from this review are that evaluation measures should be appropriate to the purpose, duration, and power of the intervention and that measures should have adequate validity and reliability in relation to both the outcomes and characteristics of the target audience. Major implications are that considerable preliminary work needs to be done before any intervention study to develop and test evaluation instruments so that they are appropriate and have adequate psychometric properties, and cognitive testing of published instruments with each new target audience is essential. We will then be better able to make judgments about the effectiveness of nutrition education.