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| Research Question | Feature | Description |
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| RQ1 | Algorithm | This feature defines if the primary study proposes an algorithm or series of algorithms |
| System | This feature defines if the primary study is a software system based on different components |
| Framework | This feature defines whether the primary study is based on a framework |
| Method | This feature defines if the primary study is a set of procedures to obtain a result |
| Analysis | This feature defines if the primary study is a theoretical study based on surveys or systematic reviews among others |
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| RQ2 | Validated | This feature defines whether the primary study has been validated with experiments, use cases, or surveys |
| Not validated | This feature defines if the primary study has not been validated with experiments, use cases, or surveys |
| Academic | This feature defines if the primary study has been validated with some academic case study |
| Industrial | This feature defines if the primary study has been validated with some case study in the industry |
| Experiment | This feature defines if the primary study has been validated with the elaboration of different experiments |
| Use case | This feature defines whether the primary study has been validated with the study of a use case |
| Survey | This feature defines if the primary study has been validated with the elaboration of some type of survey |
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| RQ3 | Content based | This feature defines whether the solution proposed by the primary study is based or composed of a recommendation system with a content-based filter |
| Collaborative | This feature defines whether the solution proposed by the primary study is based or composed of a recommendation system with a collaborative filter |
| Hybrid | This feature defines whether the solution proposed by the primary study is based or composed of a collaborative and content-based filter conjunction |
| Graph kernel | This feature defines whether the primary study is based or composed of a graphic classifier |
| Naive Bayes | This feature defines whether the primary study is based or composed of a naive probabilistic classifier naive Bayes |
| Logistic regression | This feature defines whether the primary study is based or composed of a classifier by logistic regression |
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| Decision tree | This feature defines whether the primary study is based or composed of a classifier by decision trees |
| Lexical | This feature defines whether the primary study is based or composed of a classifier based on textual features |
| Based on rules | This feature defines if the primary study is based or composed of a rule-based classifier |
| Neural networks | This feature defines if the primary study is based or composed of a classifier based on neural networks |
| Clustering | This feature defines if the primary study is based or composed of a non-supervised cluster classifier |
| Boosting | This feature defines if the primary study is based or composed of an ensemble classifier with a boosting scheme |
| Linear algorithm | This feature defines if the primary study is based on or composed of a classifier based on a linear algorithm |
| Based on attributes | This feature defines whether the primary study is based or composed of a classifier based on attributes |
| Multiclass | This feature defines if the primary study is based or composed of a multiclass classifier |
| Warehouse | This feature defines if the primary study is composed of a classifier based on data warehouse |
| SVM vectors | This feature defines if the primary study is composed of a classifier that makes use of support vector machines |
| Neighbor method | This feature defines if the primary study is composed of a classifier based on the neighbor method |
| Opinion-based | This feature defines if the primary study is composed of an opinion-based classifier |
| Target-based | This feature defines if the primary study is composed of a target-based classifier |
| Random forest | This feature defines if the primary study is composed of a random forest classifier |
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| RQ4 | Novelty | This feature defines if the primary study is a new proposal that does not exist in the literature |
| Analysis | This feature defines if the primary study is an analysis of several existing proposals in the literature |
| Research | This feature defines if the primary study is an investigation of existing or new proposals |
| Improvement | This feature defines if the primary study is an improvement of an existing proposal in the literature |
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