Dear Haskell Compiler Community, We are doing undergraduate research on software architecture patterns and quality attributes for Utah Valley University. We recently analyzed the work published on Haskell Compiler in the Architecture of Open Source Applications http://aosabook.org/en/index.html (AOSA) and referenced it in a paper we presented at the 13th Working IEEE/IFIP Conference on Software Architecture (WICSA), as attached. As a part of our continuing research we wish to validate our architectural analysis for Haskell Compiler with the current developers. We would like to know if we are missing any patterns or quality attributes that may have been included in Haskell Compiler, or if there are any we listed that aren’t used. Any additional comment on these topics you might have would also, of course, be welcome. We believe we found the following software architectural patterns in this application: Pattern Name Is This Found in the Architecture? (yes / no / don’t know) Comments (optional) Interpreter Layers Pipes & Filters Plugin Rule-Based System Other? We also identified the following quality attributes: Attribute Name Is This Found in the Architecture? Comments (optional) Scalability Usability Performance Portability Reliability Portability Maintainability Testability Modularity Robustness Other? For your convenience, we have a complete list below of the patterns and quality attributes we referred to when conducting our research. To clarify, we are specifically studying architectural patterns, rather than design patterns such as the GoF patterns. Architectural Patterns Considered Quality Attributes Considered Active Repository Scalability Batch Usability Blackboard Extensibility Broker Performance Client Server Portability Event System Flexibility Explicit Invocation Reliability Implicit Invocation Maintainability Indirection Layer Security Interceptor Testability Interpreter Capacity Layers Cost Master and Commander Legality Microkernel Modularity Model View Controller Robustness Peer to Peer Pipes and Filters Plugin Presentation Abstraction Control Publish Subscribe Reflection Rule-Based System Shared Repository Simple Repository State Based Virtual Machine Please respond by October 17, if possible. Thank you for considering our request, and for your continued work on Haskell Compiler. Sincerely, Erich Gubler, Danielle Skinner, Brandon Leishman, Michael Skeen, Neil Harrison, Ph.D. (advisor) Reference: Neil B. Harrison, Erich Gubler, Danielle Skinner, "Software Architecture Pattern Morphology in Open-Source Systems",WICSA, 2016, 2016 13th Working IEEE/IFIP Conference on Software Architecture (WICSA), 2016 13th Working IEEE/IFIP Conference on Software Architecture (WICSA) 2016, pp. 91-98, doi:10.1109/WICSA.2016.8