Communications of the ACM

President's letter

David Brandin
Pages 409-410

---

ACM forum

Robert L. Ashenhurst
Page 411

---

From Washington: attempted curbs on scientific freedom

Rosalie Steier
Pages 414-415

---

Programming pearls: squeezing space

Jon Bentley
Pages 416-es

---

The legal protection of computer software

As new as the technology itself, a sometimes confusing array of legal protections are now available to safeguard the huge investment of time and money that goes into the development of sophisticated commercial software. Robert L. Graham
Pages 422-426

---

Accommodating uncertainty in software design

Recognition that most software is domain dependent (DD) is extremely important because the most commonly used software life-cycle models are not adequate for DD software. The nature of DD software, and the need to manage its  … Richard V. Giddings
Pages 428-434

---

Self-assessment procedure XIII: a self-assessment procedure dealing with binary search trees and B-trees

Gopal K. Gupta
Pages 435-443

---

A virtual memory system for picture processing

A virtual memory system designed specifically for picture processing, Raster Handler 2 provides programs with efficient access to pixels. It features square partition of images, imbalanced allocation of frames, and nondemand  … Ben Tsutom Wada
Pages 444-454

---

An algorithm for optimized Boolean evaluation in information management systems

In cases where simple data validation techniques are inadequate and optimization policies relatively complex (e.g., in health and medical systems), a Boolean optimization algorithm can be used to report errors accurately andparser … Gerard D. Finn
Pages 455-464

---

Evolution and organizational information systems: an assessment of Nolan's stage model

Richard Nolan's stage model is the best known and most widely cited model of computing evolution in organizations. The model's development over a decade demonstrates its own evolution from a simple theory, based on the factoring … John Leslie King, Kenneth L. Kraemer
Pages 466-475

---

A critque of the stage hypothesis: theory and empirical evidence

The stage hypothesis on the assimilation of computing technology provides one of the most popular models for describing and managing the growth of administrative information systems. Despite little formal evidence of its reliability … Izak Benbasat, Albert S. Dexter, Donald H. Drury, Robert C. Goldstein
Pages 476-485

---

Design of the S system for data analysis

S is a language and system for interactive data analysis and graphics. It emphasizes interactive analysis and graphics, ease of use, flexibility, and extensibility. While sharing many characteristics with other statistical systems … Richard A. Becker, John M. Chambers
Pages 486-495

---