The aim of this study was to determine the psychometric properties of a shortened version of the Zimbardo Time Perspective Inventory (ZTPI) in an African context. This self-report questionnaire, referred to as the Zimbardo Time Perspective Inventory -Revised Form (ZTPI-RF) consists of 20 items representing the five subscales of the original scale, namely: Past-Positive, Past-Negative, Present-Hedonistic, Present-Fatalistic and Future. The ZTPI-RF was completed by participants (N=1050) from urban (n=451) and rural (n=599) areas in the North-West Province of South Africa, together with a number of measures of psychological well-being. These scales, which were included for criterion-related validity purposes, were the Affectometer 2 (short version) (Kammann & Flett, 1983), the Satisfaction with Life Scale (Diener, Emmons, Larsen & Griffin, 1985), Sense of Coherence Scale (Antonovsky, 1987, 1993) and the General Health Questionnaire (Goldberg & Hillier, 1979). Results regarding the reliability and construct validity of the ZTPI-RF and its subscales were unsatisfactory. Qualitative data was also obtained, and analyzed by means of direct content analysis to help establish a picture of how time perspective prevails in an African context, and to determine whether time perspective is associated with psychological well-being. Qualitative results showed that participants from an African context were strongly oriented toward the present and that social support played the most prominent role regarding participants' attitude toward the present. It was concluded that the ZTPI-RF is, in its current form, not reliable for the determination of time perspective of individuals from an African context, and that a longitudinal qualitative approach might be best suited to obtain information about the nature and dynamics of time perspective in an African context. / Thesis (M.A. (Psychology))--North-West University, Potchefstroom Campus, 2008.

The Employment Equity Act, 55 of 1998, Section 8 (Government Gazette, 1998) provides clear guidelines for psychometric testing in South Africa. Due to the cultural complexity of the South African population, personality tests in particular do not always comply with these specifications. Most personality tests used in South Africa have been developed in and imported from other countries, and are consequently not always appropriate for all cultural groups. Also, the majority of indigenous personality tests were developed and standardised specifically for the white population. Today a major challenge in personality assessment development is to develop and standardise inventories for the 11 official language groups in South Africa. The objectives of this study were to develop valid and reliable items for an Intellect–measuring instrument that will form part of a larger personality inventory, to investigate the factor solution of this Intellect cluster, and to compare the factor solutions of the white and African race groups respectively. An Intellect questionnaire consisting of 202 items was developed based on the qualitative phase of the South African Personality Inventory (SAPI). This research served as a pilot study. The sample consisted of (N=524) students from tertiary institutions in the Gauteng and the North West Provinces of South Africa. A quantitative design with an exploratory approach was used to collect data. Statistical analysis was used to analyse the data. The results indicated that only 18 of the original 202 items proved to be unreliable. Acceptable reliability levels for all facets were found. First–order factor analysis produced two sub–clusters: Aesthetics and Intellect. The Aesthetics sub–cluster consisted of the Artistic, Concrete work and Creative facets, and the Intellect sub–cluster consisted of the Intellect, Knowledgeable, Logical, Self–insight, Articulate, Competent, Enterprising, Perceptive, Social Intellect and Understanding facets. Second–order factor analysis indicated a single–order factor for the Intellect cluster with two second–order factors: Aesthetics and Intellect. Support was found to discard the Musical and Enterprising facets from the Intellect cluster. Similar factor solutions were found for the white and African groups - except for the Musical facet, which loaded on the Aesthetics sub–cluster for the white group and on the Intellect sub–cluster for the African group. Recommendations were made for future research. / Thesis (M.Com. (Industrial Psychology))--North-West University, Potchefstroom Campus, 2011.

This research was aimed at determining the psychometric properties of the Teacher Stress Inventory (TSI; Boyle, Borg, Falzon & Baglioni, 1995) and in doing so enabling the possible development of a much needed, more culture sensitive inventory for the measurement of teacher stress as it manifests in the South African context. A review of international literature revealed that the stress associated with the teaching profession is a well-known phenomenon, and has received increasing recognition and research attention in recent years (e.g., Brown, Howcroft & Jacobs, 2010; Chaplain, 2008; Ngidi & Sibaya, 2002; Olivier & Venter, 2003; Schwarzen & Hallum, 2008; Sharplin, O‘Neill & Chapman, 2011; Vandeyar, 2005). However, only a few studies on teacher stress in the South African context could be found. The studies that were done within the South African teaching context (Ferreira, 2008; Lund & Fisher, 2006; Møller, 2007) did report various and specific challenges that add to the stressors South African teachers need to overcome in order to maintain psychological well-being. Furthermore, these studies mostly implemented scales that were developed within a Eurocentric context, and thus did not incorporate cultural and contextual factors that are known to impact directly on both the construction and experience of psychological well-being (Temane & Wissing, 2008; Wissing & Temane, 2008; Wissing, Wissing, Du Toit, & Temane, 2006) and stress. The need for a teacher stress scale which will be valid in the South African context became apparent. Therefore, the aim of this study is to validate the TSI for use in a South African context. A cross-sectional design for data collection was used as part of the Sympathetic Activity and Ambulatory Blood pressure in Africans (SAPBA) study. The research sample consisted of urban Caucasian (n=209) and African (n=200) teachers subsiding in the North-West Province of South Africa. The TSI, the General Health Questionnaire (GHQ) and the Mental Health Continuum-Short Form (MHC-SF) were administered to all participants, together with physiological measures of stress that were taken under controlled circumstances. Based on the results from the exploratory factor analysis and item analysis that was conducted separately on the different ethnic groups, it was decided to omit items 1, 3 and 6 due to evidenced problematic psychometric properties in this study population. A further factor analysis that was conducted on the total study group showed sufficient communalities and yielded a two-factor model, with a robust factor structure and satisfactory reliability indices for both extracted factors, namely (1) General circumstance related stress and (2) Learner related stress. Satisfactory criterion-related validity was determined by correlating the TSI with other measures of psychological health, the GHQ and the MHC-SF, as well as physiological measures of health. In conclusion, the TSI proved to be a useful, brief self-report questionnaire for the assessment of occupational stress within this cohort of South African teachers. If replicated within a sample more representative of the South African context, the findings of this study will allow the impact of different sources of teacher stress to be determined and compared within the South African context. It further holds promising possibilities for influencing public policy with regard to the education system in South Africa and to contribute to the exploration of teacher stress in this context, with the aim of contributing to the psychological well-being of South African teachers. Further psychometric evaluation is however necessary before the TSI can be considered to be a valid instrument in the broad South African context. / Thesis (M.Sc. (Clinical Psychology))--North-West University, Potchefstroom Campus, 2011.

This dissertation examines two main research questions: Why do firms deviate from their predicted level of toxic emissions, and how do these differences relate to financial performance? The objective is threefold: (1) to understand deviation in corporate environmental performance by looking at both industry and firm level variables, (2) to see how this deviation relates to both profitability and fluctuations in financial performance, and (3) to see if, and how, corporate environmental legitimacy affects the relationship between corporate environmental deviation and corporate financial performance. To achieve this objective the construct “corporate environmental performance deviation” is developed. It is defined as the extent to which a firm’s environmental performance deviates from its predicted performance, and is used to capture within-firm strategic choices in environmental management. Predicted environmental performance is calculated based on certain firm characteristics such as size and industry. Actual environmental performance is calculated using a weighted score of air emissions obtained from the Toxic Release Inventory (TRI) database. The difference between these two values represents a corporation’s environmental performance deviation. Corporate environmental performance deviation focuses on strategic choices related to environmental management, while recognizing that environmental management is the result of both institutional pressures and within-firm strategic decisions. Aligned with this focus, variables 2 related to this strategic choice are used to explain deviation in environmental management, including an environmental integration capability, firm strategy, and industry munificence and dynamism. Associated with the internal and external organizational analysis, institutional theory and the resource-based view (RBV) are used to explore the tension between deviation to increase competitiveness versus isomorphism to attain legitimacy. The sample is composed of 311 U.S. firms who have reported their toxic air releases to the TRI from 1998-2007. The sample is broken down into two subsets, those that exceed (positive deviation) or fail to meet (negative deviation) predicted environmental performance. Results of a longitudinal analysis show that positive environmental deviation is related to a greater capacity to strategically integrate environmental issues into a firm’s existing business approach, less munificence and dynamism in the task environment, and reduced financial fluctuations. Negative environmental deviation is decreased through a demonstrated capacity to strategically integrate environmental issues into a firm’s existing strategic approach, and related to greater munificence and dynamism in the task environment, reduced profitability and increased financial fluctuations. Lastly, although there are no significant main effects for corporate environmental legitimacy, the paradoxical combination of negative deviation and environmental legitimacy can reduce the severity of the negative financial results to negative deviation, both in terms of profitability and financial fluctuations.

The aim of this study was to determine the psychometric properties of a shortened version of the Zimbardo Time Perspective Inventory (ZTPI) in an African context. This self-report questionnaire, referred to as the Zimbardo Time Perspective Inventory -Revised Form (ZTPI-RF) consists of 20 items representing the five subscales of the original scale, namely: Past-Positive, Past-Negative, Present-Hedonistic, Present-Fatalistic and Future. The ZTPI-RF was completed by participants (N=1050) from urban (n=451) and rural (n=599) areas in the North-West Province of South Africa, together with a number of measures of psychological well-being. These scales, which were included for criterion-related validity purposes, were the Affectometer 2 (short version) (Kammann & Flett, 1983), the Satisfaction with Life Scale (Diener, Emmons, Larsen & Griffin, 1985), Sense of Coherence Scale (Antonovsky, 1987, 1993) and the General Health Questionnaire (Goldberg & Hillier, 1979). Results regarding the reliability and construct validity of the ZTPI-RF and its subscales were unsatisfactory. Qualitative data was also obtained, and analyzed by means of direct content analysis to help establish a picture of how time perspective prevails in an African context, and to determine whether time perspective is associated with psychological well-being. Qualitative results showed that participants from an African context were strongly oriented toward the present and that social support played the most prominent role regarding participants' attitude toward the present. It was concluded that the ZTPI-RF is, in its current form, not reliable for the determination of time perspective of individuals from an African context, and that a longitudinal qualitative approach might be best suited to obtain information about the nature and dynamics of time perspective in an African context. / Thesis (M.A. (Psychology))--North-West University, Potchefstroom Campus, 2008.

The Employment Equity Act, 55 of 1998, Section 8 (Government Gazette, 1998) provides clear guidelines for psychometric testing in South Africa. Due to the cultural complexity of the South African population, personality tests in particular do not always comply with these specifications. Most personality tests used in South Africa have been developed in and imported from other countries, and are consequently not always appropriate for all cultural groups. Also, the majority of indigenous personality tests were developed and standardised specifically for the white population. Today a major challenge in personality assessment development is to develop and standardise inventories for the 11 official language groups in South Africa. The objectives of this study were to develop valid and reliable items for an Intellect–measuring instrument that will form part of a larger personality inventory, to investigate the factor solution of this Intellect cluster, and to compare the factor solutions of the white and African race groups respectively. An Intellect questionnaire consisting of 202 items was developed based on the qualitative phase of the South African Personality Inventory (SAPI). This research served as a pilot study. The sample consisted of (N=524) students from tertiary institutions in the Gauteng and the North West Provinces of South Africa. A quantitative design with an exploratory approach was used to collect data. Statistical analysis was used to analyse the data. The results indicated that only 18 of the original 202 items proved to be unreliable. Acceptable reliability levels for all facets were found. First–order factor analysis produced two sub–clusters: Aesthetics and Intellect. The Aesthetics sub–cluster consisted of the Artistic, Concrete work and Creative facets, and the Intellect sub–cluster consisted of the Intellect, Knowledgeable, Logical, Self–insight, Articulate, Competent, Enterprising, Perceptive, Social Intellect and Understanding facets. Second–order factor analysis indicated a single–order factor for the Intellect cluster with two second–order factors: Aesthetics and Intellect. Support was found to discard the Musical and Enterprising facets from the Intellect cluster. Similar factor solutions were found for the white and African groups - except for the Musical facet, which loaded on the Aesthetics sub–cluster for the white group and on the Intellect sub–cluster for the African group. Recommendations were made for future research. / Thesis (M.Com. (Industrial Psychology))--North-West University, Potchefstroom Campus, 2011.

This research was aimed at determining the psychometric properties of the Teacher Stress Inventory (TSI; Boyle, Borg, Falzon & Baglioni, 1995) and in doing so enabling the possible development of a much needed, more culture sensitive inventory for the measurement of teacher stress as it manifests in the South African context. A review of international literature revealed that the stress associated with the teaching profession is a well-known phenomenon, and has received increasing recognition and research attention in recent years (e.g., Brown, Howcroft & Jacobs, 2010; Chaplain, 2008; Ngidi & Sibaya, 2002; Olivier & Venter, 2003; Schwarzen & Hallum, 2008; Sharplin, O‘Neill & Chapman, 2011; Vandeyar, 2005). However, only a few studies on teacher stress in the South African context could be found. The studies that were done within the South African teaching context (Ferreira, 2008; Lund & Fisher, 2006; Møller, 2007) did report various and specific challenges that add to the stressors South African teachers need to overcome in order to maintain psychological well-being. Furthermore, these studies mostly implemented scales that were developed within a Eurocentric context, and thus did not incorporate cultural and contextual factors that are known to impact directly on both the construction and experience of psychological well-being (Temane & Wissing, 2008; Wissing & Temane, 2008; Wissing, Wissing, Du Toit, & Temane, 2006) and stress. The need for a teacher stress scale which will be valid in the South African context became apparent. Therefore, the aim of this study is to validate the TSI for use in a South African context. A cross-sectional design for data collection was used as part of the Sympathetic Activity and Ambulatory Blood pressure in Africans (SAPBA) study. The research sample consisted of urban Caucasian (n=209) and African (n=200) teachers subsiding in the North-West Province of South Africa. The TSI, the General Health Questionnaire (GHQ) and the Mental Health Continuum-Short Form (MHC-SF) were administered to all participants, together with physiological measures of stress that were taken under controlled circumstances. Based on the results from the exploratory factor analysis and item analysis that was conducted separately on the different ethnic groups, it was decided to omit items 1, 3 and 6 due to evidenced problematic psychometric properties in this study population. A further factor analysis that was conducted on the total study group showed sufficient communalities and yielded a two-factor model, with a robust factor structure and satisfactory reliability indices for both extracted factors, namely (1) General circumstance related stress and (2) Learner related stress. Satisfactory criterion-related validity was determined by correlating the TSI with other measures of psychological health, the GHQ and the MHC-SF, as well as physiological measures of health. In conclusion, the TSI proved to be a useful, brief self-report questionnaire for the assessment of occupational stress within this cohort of South African teachers. If replicated within a sample more representative of the South African context, the findings of this study will allow the impact of different sources of teacher stress to be determined and compared within the South African context. It further holds promising possibilities for influencing public policy with regard to the education system in South Africa and to contribute to the exploration of teacher stress in this context, with the aim of contributing to the psychological well-being of South African teachers. Further psychometric evaluation is however necessary before the TSI can be considered to be a valid instrument in the broad South African context. / Thesis (M.Sc. (Clinical Psychology))--North-West University, Potchefstroom Campus, 2011.

<p>We propose an approximation scheme for single-product periodic-review inventory systems with L-natural-convex structure. We lay out three well-studied inventory models, namely the lost-sales system, the perishable inventory system, and the joint inventory-pricing problem. We approximate the value functions for these models by the class of L-natural-convex quadratic functions, through the technique of linear programming approach to approximate dynamic programming. A series of heuristics are derived based on the quadratic approximation, and their performances are evaluated by comparison with existing heuristics. We present the numerical results and show that our heuristics outperform the benchmarks for majority of cases and scale well with long lead times. In this dissertation we also discuss the alternative strategies we have tried but with unsatisfactory result.</p> / Dissertation

This study examined the Ball State Diagnostic Inventory. First, the construct validity of the measure and the 14 corresponding psychiatric diagnoses was considered. Secondarily, the investigation considered the psychiatric epidemiology of a college-age population.A review of the literature was presented with an emphasis on psychiatric syndromes, the Neo-Kraepelinian tradition, and the development of empirically based diagnostic criteria. The construction of the Ball State Diagnostic Inventory was placed in the historical context of the assessment of empirically based descriptive diagnostic criteria.One thousand and twenty-two undergraduate and graduate students from four U.S. universities volunteered to complete the Ball State Diagnostic Inventory. Participants were screened for prior psychiatric treatment or a course of psychotrophic medication. The mean chronological age of the subjects was 20.6 years (SD = 1.25) with a range of 18 to 28. The Ball State Diagnostic Inventory is a 218-item measure of adult psychopathology as reflected in the diagnostic criteria of the Diagnostic Inventory Schedule.The results showed the epidemiological point prevalence rates for this college age sample to correspond to other estimates. The 14-factor solution provided evidence of grouping of symptoms into traditionally defined diagnostic categories. Moreover, derived factors were similar to previous factor analytical studies with major psychiatric syndromes.The results were discussed in terms of their support for the utility of empirically based diagnostic criteria. Further investigations with the Ball State diagnostic Inventory were explored. / Department of Educational Psychology

The City of Victoria is experiencing increased food insecurity due to its location on Vancouver Island in British Columbia, and a lack of food production in the city. The practice of urban agriculture presents a potential solution, enhancing food security by localizing resources, while increasing access and participation with local food production. Based on urban agriculture land inventories (UALIs) conducted in Portland, Vancouver and Nanaimo, my research evaluates and develops site selection criteria specific to Victoria for conducting a community garden land inventory focused on identifying land for allotment and commons gardens. I also examine the underlying barriers or supports for allotting land to urban agriculture in Victoria. To generate site selection criteria and explore the barriers and supports, I conducted interviews with urban agriculture experts, including city planners; community garden activists, educators and individuals involved in non-profits, and urban producers engaged in urban food production. The site selection criteria were further assessed as primary criteria for their application in GIS or secondary criteria to be considered during site visits. The final primary site selection criteria were land use and type, water availability (within 6.8 m), proximity to density users (within 400 m), minimum size thresholds of 1189.2 m2 for allotment gardens and 139.4 m2 for commons gardens, and excluding buildings, heritage designations, and protected green space. The analysis of the primary criteria resulted in a map illustrating 248 potential sites for community gardens in Victoria, whereby 213 were only suitable for commons gardens and 35 were suitable for allotment or commons gardens due to the larger size threshold. Four of the resulting sites were ground-truthed using site visits, and had medium to high potential for community gardens. The site visits documented secondary criteria, including proximity to community hub or prominent location, sunlight, ecologically sensitive area, cedar trees, and pollinator habitat or vegetation. Highlights from the interviews included identifying the most influential factors to allotting land to urban agriculture: the perception and awareness of urban agriculture, the community, the politics of City Council and staff support, and the costs or financial supports associated with community gardens. Overall, this research provides a model for the decision making process behind establishing an UALI, and contributes to understanding the challenges to allotting land to agriculture in the urban environment. / Graduate / 0768 / 0473 / jsauter@uvic.ca