If an abstract is available, look for the purpose of the study (authors will likely provide the rationale for their research in the first or second sentence). The abstract should also mention the methodology, results, and conclusion.
Try to answer the following questions after reading the abstract:
1. What is the purpose of the research?
2. What method(s) were used to conduct the research?
3. What were the results of the research?
4. What do the authors conclude about their research results?