The journal accepts different paper formats, to be concrete:

- Research paper: This is the most common paper format. It needs to provide a novel research contribution not published in any other journal. It can also provide an extension of a conference paper, but the contribution of the submission must be at least a 50% novel. The recommended number of pages is 16, although the maximum is 40.

- Short paper: This kind of paper follows the same rules as a research paper, but the recommended number of pagers is 8 and the maximum 15.

- Survey paper: A literature review of different papers into a specific topic. The authors will need to specify the collection methodology and provide a comprenhensive contribution. The recommended number of pages is 30, although the maximum is 50.

- Tool paper: This type of paper focuses on a specific tool. The tool needs to be created by the author/s. If the tool is a software solution to an already published research paper, we recommend the authors to provide the reference. The tool must be open source or free software. A tool paper needs to describe: the problem the tool aims to solve, how it solves, limitations, some implementation details for developer about the tool structure, and an usage manual with some examples. The recommended number of pages is 15, although the maximum is 40.

- Negative Results paper: This kind of paper follows the same rules of a "Research paper" but it focus on novel work with negative results. We encorage authors to also publish those results that are not successful to provide guidance to future researchers.

- Project Report: These reports aim to present or promote a research project. The recommended lenght is 3 pages and the limit is 10 pages. We encorage the authors to provide an introduction motivating the project aim, context on the project methodologies, a section with the solutions the project has found, the list of contributions of the project, and future research lines.