Project management, as a recognized core business competency, must incorporate planning, execution and implementation procedures within a broader sustainability framework, i.e. internalizing the externalities of a project. Current project life cycle management (LCM) methodologies do not efficiently address the objectives of sustainable development, especially in developing countries such as South Africa. Social aspects are rarely considered, while environmental factors are typically only addressed by means of environmental impact assessments (EIAs). A procedure to improve the consideration of environmental aspects in project LCM is subsequently introduced for South Africa. The procedure is demonstrated by means of a case study in the process industry. A framework is further proposed of social sustainability criteria that are relevant to projects within the process industry. The acceptability of the framework to decision-makers in petrochemical companies is discussed. Case studies are further suggested to evaluate the practicability of measurable social impact indicators for project LCM.

The Open Solution Methodology is a generic problem solving methodology which is used to solve system related problems through the application of problem solving techniques. The focus of the application of this methodology is aimed at modelling organisations, or areas within organisations. The application ofthe Open Solution Methodology provides the benefit of having the ability to comprehend and integrate all aspects of the system, while having a formal and structured approach for problem solving. Together with the reduction in system analysis time, problem solving techniques such as simulation modelling are focused through the Open Solution Methodology models to enhance the quality Ofsolutions. OPSOMMINGDie "Open Solution Methodology" is 'n generiese probleemoplossingsmetodologie wat gebruik word om stelselverwante probleme op te los deur die toepassing van problemoplossingstegnieke. Die fokus van hierdie metodologie toepassing is gernik op die modellering van organisasies, of gedeeltes van organisasies. Die "Open Solution Methodology" toepassing verskaf die voordeel om aile aspekte van die stelsel te verstaan en te integreer, terwyl daarvan 'n formele en gestruktureerde benadering tot probleemoplossing gebruik gemaak word. Tesame met die gepaardgaande verkorting van stelselanalisetyd, word die "Open Solution Methodology" modelle gebruik om die toepassing van probleemoplossingstegnieke te fokus omsodoende kwaliteit van die oplossings te verhoog.http://sajie.journals.ac.za 73

Numerous Software Reliability Growth Models (SRGMs) have been discussed in the literature. These models are used to predict fault content and reliability of software. It has been observed that the relationship between testing time and the corresponding number of faults removed is either exponential or S-shaped, or a mix of the two. Another important class of SRGMs, known as flexible SRGMs, can depict both exponential and S-shaped growth curves. The paper introduces a new concept of power logistic learning function that proves to be very flexible, in the sense that it represents various curve types -exponential, Rayleigh, Weibull or simple logistic. The flexible nature of the power logistic function gives the flexible SRGM a higher degree of accuracy and wider applicability. OPSOMMINGVerskeie voorbeelde van Betroubaarheidsgroeimodelle vir programmatuur word in die literatuur beskryf. Die modelle word gebruik vir die voorspelling van foutinhoud en programmatuurbetroubaarheid. Daar word waargeneem dat die verband tussen toetstyd en die resulterende foutverwydering eksponensiaal of S-vormig of 'n kombinasie daarvan is. Aanpasbare modelle insluitende diskrete ekwivalente word ook behandel. Die publikasie ontleed vervolgens algemene plooibare maglogistieke leerkromme met wye toepasbaarheid wat slaan op eksponensiële, Rayleigh-, Weilbull-en logistieke funksies. Die plooibaarheid van die model waarborg akkuraatheid en wye toepasbaarheid met die verlangde gehalte van voorspelbaarheid.

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OPSOMMINGDie verwantskap tussen stelselprestasie en die omvang van logistieke steun wat 'n stelsel ontvang, word kortliks bespreek. 'n Teoretiese optimum vlak van logistieke steun word gedetinieer en daar word getoon dat die bepaling van die optimum 'n ingewikkelde soekproses behels. In die artikel word die eienskappe van rekenaarprogrammatuur wat in die soeke na die optimum vlak van logistieke steun gebruik kan word, bespreek en aan die hand van 'n eenvoudige voorbeeld gemustreer. SUMMARYThe relationship between system performance and the level of logistic support that a system receives is discussed. A theoretical optimum level of logistic support is defined and it is shown that the determination of this optimum entails a complex search procedure. Computer software that can be used in the search for the optimum level of logistic support is discussed and the use thereof illustrated by means of a simple example.