The following technical report is available from http://aib.informatik.rwth-aachen.de:

Proceedings of the International Joint Workshop on Implementation of Constraint and Logic Programming Systems and Logic-based Methods in Programming Environments 2014 Thomas Ströder and Terrance Swift (Editors) AIB 2014-09

Software plays a crucial role in modern society. While the continuous advent of faster, smaller and more powerful computing devices makes the development of new and interesting applications feasible, it puts even more demands on the software developer. Indeed, while software keeps on growing in size and complexity, it is more than ever required to be delivered on time, free of error and to meet the most stringent efficiency requirements. Consequently, it is widely recognized that there is a need for methods and tools that support the programmer in every aspect of the software development process.

Having logic as the underlying formalism means that logic-based analysis techniques are often successfully used for program verification and optimization. Emerging programming paradigms and growing complexity of the properties to be verified pose new challenges for the community, while emerging reasoning techniques can be exploited.

The International Colloquium on Implementation of Constraint and LOgic Programming Systems (CICLOPS) provides a forum to discuss the design, implementation, and optimization of logic, constraint (logic) programming systems, and other systems based on logic as a means of expressing computations. Experience backed up by real implementations and their evaluation is given preference, as well as descriptions of work in progress in that direction.

The aim of the Workshop on Logic-based methods in Programming Environments (WLPE) is to provide an informal meeting for researchers working on logic-based methods and tools that support program development and analysis. As in recent years, these topics include not only environmental tools for logic programming, but increasingly also logic-based environmental tools for programming in general and frameworks and resources for sharing in the logic programming community.

The combination of these two areas of interest in this year’s joint workshop provides a forum to discuss together the states of the art for using logic both in the evaluation of programs and in meta-reasoning about programs.

Due to the strong overlap between the CICLOPS-WLPE community and several FLoC communities (in particular logic (programming), verification, automated reasoning, rewriting techniques, and SAT solving), the workshop is affiliated to several conferences: - 30th International Conference on Logic Programming (ICLP) - 26th International Conference on Computer Aided Verification (CAV) - 7th International Joint Conference on Automated Reasoning (IJCAR) - Joint meeting of the 23rd EACSL Annual Conference on Computer Science Logic (CSL) and the 9th ACM/IEEE Symposium on Logic in Computer Science (LICS) - 25th International Conference on Rewriting Techniques and Applications (RTA) joined with the 12th International Conference on Typed Lambda Calculi and Applications (TLCA) - 17th International Conference on Theory and Applications of Satisfiability Testing (SAT)

In 2014, CICLOPS-WLPE also joins its program with the 11th International Workshop on Constraint Handling Rules (CHR) and has one joint session together with the Workshop on Probabilistic Logic Programming (PLP).

The International Joint Workshop on Implementation of Constraint and Logic Programming Systems and Logic-based Methods in Programming Environments 2014 consists of nine regular submissions and two invited talks. These informal proceedings contain the regular papers and the abstracts of the two invited talks.