PERCEIVED USEFULNESS OF INFORMATION: A PSYCHOMETRIC EXAMINATION*

The perceived usefulness of information is an important construct for the design of management information systems. Yet an examination of existing measures of perceived usefulness shows that the instruments developed have not been validated nor has their reliability been verified. In this paper a new instrument for measuring two dimensions of perceived usefulness is developed. The results of an empirical study designed to test the reliability and construct validity of this instrument in a capital-budgeting setting are presented.     

论中国藏书史的内涵

中国藏书史的内涵,大致可以分为藏书的搜求、图书鉴别、图书校勘、藏书抄补、图书储藏、藏书传录、藏书刊本、藏书题跋、藏书用印、藏书保护、藏书建筑、藏书编目、藏书思想、藏书毁散等部分,对其进行系统研究,有利于促使藏书史成为一门独立的学科.     

Solving the Economic Lot-Scheduling Problem Using the Method of Prime Subperiods

In recent years the reported successes of Japanese production systems, particularly the just-in-time approach to inventory control, has caused managers to focus more of their attention on efficient decision-making procedures for determining production schedules that minimize inventory costs. One such potential area of attention is the economic lot-scheduling problem (ELSP), which occurs in a variety of manufacturing environments where machining operations are prevalent. The economic lot-scheduling problem addresses the determination of lot sizes for N products with constant demand (and cycled through one machine with a given production rate) to minimize setup and inventory costs. The most successful solution approaches to the ELSP have been based on the concept of a basic period that is of sufficient length for the production of all items, even though each item might not be produced during each repetition of the basic period. This paper proposes a heuristic approach to the solution of the ELSP (referred to as the method of prime subperiods), which is an extension of the basic period approaches. The procedure is described and demonstrated via an example and then tested using a set of six example problems previously employed in the literature related to the ELSP. The results indicate as good or superior performance by the proposed method of prime subperiods.     

Impact of Information Systems (IS) Steering Committees on IS Planning*

One of the most efficient ways to manage the information systems function is to introduce steering committees. It has been suggested that one of the foremost benefits of a steering committee is that it can improve the information systems planning efforts of an organization. However, there is very little empirical evidence in the literature that deals with how such committees affect planning. This study investigates the impact of steering committees on three phases of information systems planning: strategic planning, systems planning, and implementation of planning. The greatest impact of steering committees appears to be the strategic planning phase, while a lesser effect is observed in the systems planning and implementation of planning phases.     

The Impact of Alternative Vendor/ Buyer Communication Structures on the Quality of Purchased Materials

This paper examines the critical interface between manufacturing, purchasing, and quality assurance by exploring the impact of two alternative structures of buyer and vendor communication on attempts to improve the quality of purchased items. Those two structures of communication are the parallel structure and the serial structure. The research analyzes and compares the advantages and disadvantages of these two specific communication structures; the results have implications for both researchers and managers. The analysis of data suggests that the parallel structure is associated with significantly higher levels of quality than the serial structure. From a managerial perspective, the results of the research suggest that manufacturers must consider the parallel communication structure as a viable alternative for improving the quality of purchased components. While this study has helped frame some key managerial issues, the need and opportunity for further research in related areas is delineated.     

A Theory of Production Competence*

Production competence is an enigmatic functional phenomenon. What is it? Can it be measured? Does it affect business performance? The literature barely touches on these issues. If competence is defined as a variable rather than a fixed attribute, it can be measured by how well manufacturing's strengths and weaknesses complement the priorities of the business strategy. Since performance is a measure of how well that strategy works, there should be a definable relationship between competence and performance. This study proposes just such a relationship and promotes production competence as the theoretical link between production process and business strategy.     

The Airline Discount Fare Allocation Problem

This paper describes a useful extension of the well-known, single-period inventory or newsboy problem. Given a fixed number of identical seats available on a scheduled airline flight, what percentage should be offered for early sale at a predetermined discount fare and what percentage reserved for later sale at a higher full fare? This two-tiered pricing strategy with early discount pricing might be appropriate in any situation in which the price sensitivity of the inventoried items decreases as the end of the period approaches. Similar to the newsboy problem solution, the decision rule that maximizes expected profit is expressed as a simple function of the percentage difference in the two fares and two carefully defined probabilities.     

Inventory Control and Scheduling of Multiple Products in a Common Facility*

Consider a set of chemical products to be produced in a single facility. Each product has its own unique reaction time (which is assumed to be independent of its batch size), as well as other cost and demand values. In this paper, we address the problem of determining the optimal number of batches, batch sizes, and an accompanying production schedule for these products in the single facility that will minimize the total cost. Two different algorithms have been developed for this problem, the performances of which are contrasted with classical cyclic production schedules. Finally, some guidelines for the application of these methods to real-life problems are outlined.     

System Development Project Effectiveness: Problem-Solving Competence as a Moderator Variable*

In spite of end-user programming, for the foreseeable future users and information systems (IS) specialists will build systems together. A better understanding of this partnership (which has a troubled history) will help IS managers and users improve their management skills. This study investigates the relative contributions to project effectiveness of problem-solving competence, the quality of the working relationship, and the quality of the development process. Seventy-five medium-sized projects in 16 organizations were investigated using individual, one hour, structured interviews with the IS project leader and with the primary user. Results suggest that more complex models should be used to study system development. Moreover, problem-solving competence demonstrated a complex effect on project effectiveness.     

The Performance of MRP Purchase Lot-Size Procedures Under Actual Multiple Purchase Discount Conditions

Several heuristic procedures for purchase lot sizing in material requirements planning (MRP) systems were tested with actual data from manufacturing companies. Information provided by the companies for each purchased item included the estimated requirements and costs, the price discount structure from the vendor, and the actual company ordering policy. Simulation tests for each purchased item involved comparisons of several purchase lot-size procedures from the research literature along with the actual procedure used by the company providing the data. Results indicate that one of the heuristic lot-size procedures from the literature consistently outperformed the company policies as well as all other models tested. Another noteworthy result is that, in some cases, the actual company order policy was more cost-effective than some of the models from the research literature.