Invited Papers -- Building Formal Requirements Models for Reliable Software -- Using Ada in Interactive Digital Television Systems -- Testing from Formal Specifications, a Generic Approach -- Logic versus Magic in Critical Systems -- Can Java™ Meet Its Real-Time Deadlines? -- Program Analysis -- Parameter-Induced Aliasing in Ada -- Slicing Tagged Objects in Ada -- OASIS – An ASIS Secondary Library for Analyzing Object-Oriented Ada Code -- Distributed Systems -- Building Modern Distributed Systems -- Reliable Communication in Distributed Computer-Controlled Systems -- Building Robust Applications by Reusing Non-robust Legacy Software -- Real-Time Systems -- New Developments in Ada 95 Run-Time Profile Definitions and Language Refinements -- Complex Task Implementation in Ada -- Implementing a Flexible Scheduler in Ada -- Language and Patterns -- Expression Templates in Ada -- A Design Pattern for State Machines and Concurrent Activities -- Component Libraries and Language Features -- Dependable Systems -- Using the SPARK Toolset for Showing the Absence of Run-Time Errors in Safety-Critical Software -- Scenario-Based System Assessment -- Test Suite Reduction and Fault Detecting Effectiveness: An Empirical Evaluation -- APIs and Components -- JEWL: A GUI Library for Educational Use -- Object-Oriented Stable Storage Based on Mirroring -- Transaction Support for Ada -- Real-Time Kernels -- MaRTE OS: An Ada Kernel for Real-Time Embedded Applications -- Implementing Ada.Real Time.Clock and Absolute Delays in Real-Time Kernels -- Defining New Non-preemptive Dispatching and Locking Policies for Ada -- Standard Formats: UML & XML -- Modelling Communication Interfaces with ComiX -- Safe Web Forms and XML Processing with Ada -- Mapping UML to Ada -- System Evolution -- Ship System 2000, a Stable Architecture under Continuous Evolution -- Migrating Large Applications from Ada83 to Ada95 -- An Application Case for Ravenscar Technology: Porting OBOSS to GNAT/ORK.

The Sixth International Conference on Reliable Software Technologies, Ada- Europe 2001, took place in Leuven, Belgium, May 14-18, 2001. It was sponsored by Ada-Europe, the European federation of national Ada societies, in cooperation with ACM SIGAda, and it was organized by members of the K.U. Leuven and Ada- Belgium. This was the 21st consecutive year of Ada-Europe conferences and the sixth year of the conference focusing on the area of reliable software technologies. The use of software components in embedded systems is almost ubiquitous: planes fly by wire, train signalling systems are now computer based, mobile phones are digital devices, and biological, chemical, and manufacturing plants are controlled by software, to name only a few examples. Also other, non-embedded, mission-critical systems depend more and more upon software. For these products and processes, reliability is a key success factor, and often a safety-critical hard requirement. It is well known and has often been experienced that quality cannot be added to software as a mere afterthought. This also holds for reliability. Moreover, the reliability of a system is not due to and cannot be built upon a single technology. A wide range of approaches is needed, the most difficult issue being their purposeful integration. Goals of reliability must be precisely defined and included in the requirements, the development process must be controlled to achieve these goals, and sound development methods must be used to fulfill these non-functional requirements.