Abstract. The objective of this study was to investigate the quality and usability of three Free/Libre Open Source Software assessment models: the Open Business Readiness Rating (OpenBRR), the Qualification and Selection of Open Source software (QSOS), and the QualiPSo OpenSource Maturity Model (OMM). The study identified the positive and negative aspects of each of them. The models were used to assess two Free/Libre Open Source Software projects: Firefox and Chrome (Chromium). The study is based on a set of controlled experiments in which the participants performed the assessment using only one model each. The model used and the Free/Libre Open Source Software project assessed were randomly assigned to the participants. The experiment was conducted in a controlled environment with defined tasks to be performed in a given time interval. The results revealed that the three models provided comparable assessments for the two assessed projects. The main conclusion was that all the three models contain some questions and proposed answers that are not clear to the assessors, therefore should be rewritten or explained better. The critical aspects of each model were: Functionality and Quality for OpenBRR; Adoption, Administration/Monitoring, Copyright owners, and Browser for QSOS ; and Quality of the Test Plan, and the Technical Environment for OMM. Participants perceived the quality and usability of the three models of comparable level.

The paper introduces the Open Maturity Model that is an assessment model for the Free/Libre Open Source software development process evaluation. The model was based on the knowledge about the Free/Libre Open Source Software process obtained with an extensive research of Free/Libre Open Source Software developers, users and integrators. The structure of the model resembles in many aspects the Capability Maturity Model. We decided to propose a tree level scale in order to keep it as simple as possible and make it attractive for Free/Libre Open Source Software communities. The proposed model is a means to increase the quality of the Free/Libre Open Source Software products and can promote their larger adoption.

Abstract. The paper presents a survey of mature Free/Libre Open Source Software communities. The main focus of the survey is the collection of data related to the practices of these communities related to trust elements in their products. The survey is carried out using a structured questionnaire about thoughts and practices followed by Free/Libre Open Source Software communities. The survey focuses on the analysis of the development processes adopted by such communities. The results of the survey confirms basic ideas related to Free/Libre Open Source Software and explains in more detail specific issues related to trust and trustworthiness of the Free/Libre Open Source Software development process. Process

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