title: Book Review: Cycles of disadvantage?

authors: Barnes, Jo

subjects: life cycle poverty

abstract: Review of Scott Boggess, Mary Corcoran and Stephen P Jenkins. Cycles of disadvantages?

text: Book Review: Cycles of disadvantage? Review of Scott Boggess, Mary Corcoran and Stephen P Jenkins. Cycles of disadvantages?

year: 2000

title: Simplified system dynamics: a methodology for corporate modelling

authors: Craig, Grahame David

abstract: This thesis deals with the development and application of a methodology for constructing corporate planning models. The methodology is based on a framework of general systems concepts consisting of elements from the System Dynamics and Input-Output approaches to the modelling of complex systems. These concepts permit the use of explicit and efficient procedures for constructing corporate planning models, which support each of the conceptual, verbal, graphical and mathematical phases of the model abstraction process. 

Support for the model programming and computational phases is provided by a system of interactive computer programs, written in the ‘BASIC’ language, for a Digital PDP 11/70 timesharing computer. The technical details of these programs and their use, are contained in the Appendices.

Discussion of the methodology is preceded by reviews of both management science and corporate planning, which focus on their respective development histories, future development directions, and their inter-relationship. These reviews provide a foundation for examining the role of computer-based models in corporate planning. In particular, the importance of modelling in resolving the conflicts and problems of corporate planning is established.

Following appraisal of a selection of systems-based modelling methodologies, including System Dynamics, a simplified version of this methodology is presented. This version permits the construction of more open models in which priority is accorded to representation of the structured, mechanistic relationships of the system being modelled.

Introduction of the matrix algebra concepts of Input-Output Analysis enables systems to be represented as vectorised networks, which in turn facilitate the construction of less aggregated models. 

A series of ten applications of the simplified System Dynamics methodology, involving the construction of both financial and non-financial models, is then presented. These applications, together with a comparative study using a typical ‘non-systems’ approach to the construction of a benchmark financial model, provide the basis for assessment of the methodology. This assessment is made in terms of its strengths and weaknesses, and of some recent technological advances in computing. 

As a systems approach to corporate modelling, the methodology is found to meet the needs of corporate planners more closely than any of the existing systems methodologies. The representation of systems as open vectorised networks facilitates model-building and the construction of more flexible, understandable models. These advantages increase markedly as the scale of models constructed with the methodology increases.

The weaknesses of simplified System Dynamics are found to relate directly to the limitations of the current version of the computer software system which supports it. This software system must therefore be upgraded if these weaknesses are to be eliminated. This upgrading should proceed in a manner which takes maximum advantage of the data base management and graphics capabilities of modern time-sharing computers.

text: Simplified system dynamics: a methodology for corporate modelling This thesis deals with the development and application of a methodology for constructing corporate planning models. The methodology is based on a framework of general systems concepts consisting of elements from the System Dynamics and Input-Output approaches to the modelling of complex systems. These concepts permit the use of explicit and efficient procedures for constructing corporate planning models, which support each of the conceptual, verbal, graphical and mathematical phases of the model abstraction process. 

Support for the model programming and computational phases is provided by a system of interactive computer programs, written in the ‘BASIC’ language, for a Digital PDP 11/70 timesharing computer. The technical details of these programs and their use, are contained in the Appendices.

Discussion of the methodology is preceded by reviews of both management science and corporate planning, which focus on their respective development histories, future development directions, and their inter-relationship. These reviews provide a foundation for examining the role of computer-based models in corporate planning. In particular, the importance of modelling in resolving the conflicts and problems of corporate planning is established.

Following appraisal of a selection of systems-based modelling methodologies, including System Dynamics, a simplified version of this methodology is presented. This version permits the construction of more open models in which priority is accorded to representation of the structured, mechanistic relationships of the system being modelled.

Introduction of the matrix algebra concepts of Input-Output Analysis enables systems to be represented as vectorised networks, which in turn facilitate the construction of less aggregated models. 

A series of ten applications of the simplified System Dynamics methodology, involving the construction of both financial and non-financial models, is then presented. These applications, together with a comparative study using a typical ‘non-systems’ approach to the construction of a benchmark financial model, provide the basis for assessment of the methodology. This assessment is made in terms of its strengths and weaknesses, and of some recent technological advances in computing. 

As a systems approach to corporate modelling, the methodology is found to meet the needs of corporate planners more closely than any of the existing systems methodologies. The representation of systems as open vectorised networks facilitates model-building and the construction of more flexible, understandable models. These advantages increase markedly as the scale of models constructed with the methodology increases.

The weaknesses of simplified System Dynamics are found to relate directly to the limitations of the current version of the computer software system which supports it. This software system must therefore be upgraded if these weaknesses are to be eliminated. This upgrading should proceed in a manner which takes maximum advantage of the data base management and graphics capabilities of modern time-sharing computers.

year: 1982

title: Tūhoe on the move: Regional mobility

authors: Guerin, Pauline

abstract: Academic interest in geographic mobility of indigenous peoples has increased in recent years with a corresponding growth in the literature relating to Māori mobility more specifically. With this greater acknowledgement of Māori issues has also come an awareness of the need for iwi-specific research because of the diversity within and between Māori and iwi. The present research contributes to a larger project exploring Tūhoe regional mobility. In this paper, we analyse published data and unpublished census data from 2001 that relate specifically to Tūhoe regional mobility and the relationship between mobility and language. Region of residence in 1996 and 2001 were analysed in relation to age, sex, and broad language groups. Overall, this analysis found important and diverse relationships between age, sex, language, and region of residence in New Zealand among Māori who identify as Tūhoe. For example, patterns of mobility for different age groups and sex had some similarities with other research, such as a higher proportion of “stayers” in older age groups, but differences were also found, such as higher proportions of “movers” among females in some age groups. Interestingly, we found that language between “movers” and “stayers” differed depending on the region of residence. A greater proportion of “movers” were able to converse in Māori in Auckland and the Waikato, but a slightly greater proportion of “stayers” could converse in Māori in the Hawke’s Bay and Bay of Plenty. These results suggest that geographic mobility among Māori, and Tūhoe more specifically, are complex and should not be overly-simplified in more aggregate analyses.

text: Tūhoe on the move: Regional mobility Academic interest in geographic mobility of indigenous peoples has increased in recent years with a corresponding growth in the literature relating to Māori mobility more specifically. With this greater acknowledgement of Māori issues has also come an awareness of the need for iwi-specific research because of the diversity within and between Māori and iwi. The present research contributes to a larger project exploring Tūhoe regional mobility. In this paper, we analyse published data and unpublished census data from 2001 that relate specifically to Tūhoe regional mobility and the relationship between mobility and language. Region of residence in 1996 and 2001 were analysed in relation to age, sex, and broad language groups. Overall, this analysis found important and diverse relationships between age, sex, language, and region of residence in New Zealand among Māori who identify as Tūhoe. For example, patterns of mobility for different age groups and sex had some similarities with other research, such as a higher proportion of “stayers” in older age groups, but differences were also found, such as higher proportions of “movers” among females in some age groups. Interestingly, we found that language between “movers” and “stayers” differed depending on the region of residence. A greater proportion of “movers” were able to converse in Māori in Auckland and the Waikato, but a slightly greater proportion of “stayers” could converse in Māori in the Hawke’s Bay and Bay of Plenty. These results suggest that geographic mobility among Māori, and Tūhoe more specifically, are complex and should not be overly-simplified in more aggregate analyses.

year: 2006