Discussing the future value of computers as tools for cognitive development, the volume reviews past literature and presents new data from a Piagetian perspective. Constructivism in the Computer Age includes such topics as: teaching LOGO to children; the computers effects on social development; computer graphics as a new language; and computers as a means of enhancing reflective thinking.

Discussing the future value of computers as tools for cognitive development, the volume reviews past literature and presents new data from a Piagetian perspective. Constructivism in the Computer Age includes such topics as: teaching LOGO to children; the computers effects on social development; computer graphics as a new language; and computers as a means of enhancing reflective thinking.

How computer technology can transform science education for children.

Presents key principles of constructivist-based learning environments: curriculum based on primary concepts, instruction premised on learners' point of view and assessment in service to the learner.

This book is about the implications of constructivism for instructional design practices, and more importantly, it is about a dialogue between instructional developers and learning theorists. Working with colleagues in each discipline, the editors were amazed to find a general lack of familiarity with each others' work. From an instructional design perspective, it seems that the practice of instructional design must be based on some conception of how people learn and what it means to learn. From a learning theory perspective, it seems obvious that the value of learning theory rests in the ability to predict the impact of alternative learning environments or instructional practices on what is learned. Thus the interchange of ideas between these disciplines is essential. As a consequence of both the information rich environment and the technological capability, business is seen moving away from a fixed curriculum and toward providing information and instruction when it is needed. These changes bring about a window of opportunity establishing a dialogue that will provide for a richer understanding of learning and the instructional environment required to achieve that learning. The editors hope that this book is the beginning of the conversation and that it will serve to spur continued conversation between those involved in learning theory and those involved in the design of instruction.

Most organisations try to protect their systems from unauthorised access, usually through passwords. Considerable resources are spent designing secure authentication mechanisms, but the number of security breaches and problems is still increasing (DeAlvare, 1990; Gordon, 1995; Hitchings, 1995). Unauthorised access to systems, and resulting theft of information or misuse of the system, is usually due to hackers "cracking" user passwords, or obtaining them through social engineering. System security, unlike other fields of system development, has to date been regarded as an entirely technical issue - little research has been done on usability or human factors related to use of security mechanisms. Hitchings (1995) concludes that this narrow perspective has produced security mechanisms which are much less effective than they are generally thought to be. Davis & Price (1987) point out that, since security is designed, implemented, used and breached by people, human factors should be considered in the design of security mechanism. It seems that currently hackers pay more attention to human factors than security designers do. The technique of social engineering, for instanc- obtaining passwords by deception and persuasion- exploits users' lack of security awareness. Hitchings (1995) also suggests that organisational factors ought to be considered when assessing security systems. The aim of the study described in this paper was to identify usability and organisational factors which affect the use of passwords. The following section provides a brief overview of authentication systems along with usability and organisational issues which have been identified to date. 1.