Table 2. Overview of the content of the clusters, selected strategies and average ratings of clusters items.

CLUSTERDESCRIPTION	SELECTED STRATEGIES	RELEVANCE	FEASIBILITY
PHASE 1. POLITICAL AWARENESS
Putting femicide on the public agenda—Strategies to enhance political will in order to make femicide a public priority.	- Ensuring political will and commitment (1). Putting the concept of femicide into the academic, social, political and legal agenda (4).	5.05	4.29
Media coverage- Strategies to improve the quantity and quality of media coverage of the problem of femicide.	- Publicizing the information on femicide through accessible communication venues (9). Training journalists on how to report these cases properly (10).	4.70	4.44
Awareness raising on data collection—Strategies to raise awareness of the importance of collecting accurate data on femicide among data collectors and stakeholders.	- Alerting the public institutions, ministries and other state authorities to the need to identify, register and analyze the characteristics of femicide as a specific crime (14). Increasing awareness among data collection personnel (15).	4.88	4.40
Definition—Strategies to reach consensus on a definition of femicide that captures the complexity of the phenomenon.	Establishing a clear definition of femicide across countries (22).	4.69	4.04
PHASE 2. TECHNICAL STEPS
Quality of data collectors—Strategies to improve the quality of the data collection systems on femicide, with special focus on adequate sensitization and training of professionals involved in the collection and reporting of data.	Training those in charge of collecting those data on the importance of gathering correct information on all relevant aspects (28).	5.10	3.74
Institutionalization of national data base—Strategies to ensure that countries have a publicly funded, centralized and sustainable data collection system on femicide.	- Establishing a database, publicly funded and sustained, to collect information on all forms of violence against women including femicide (32). Developing a centralized system that gathers data from all relevant institutions (34).	5.28	4.12
Data collection structure—Strategies to ensure the quality of data collection systems of femicide, with focus on structural and organizational aspects.	- Standardizing data collection systems across police and court data collection system (42). Deciding on what information to collect based on the state of the art of the issue (50).	4.66	3.90
Variables to be collected—Suggestions for specific, standardized information to be gathered for every case of a female homicide.	- Collecting basic socioeconomic data on victims and offenders, including their age, education level, employment status and/or occupational class, place of birth, and area of residence (11). Ensuring that all types of data collection systems (crime, court, etc.) collect at least the following information: sex of both victim and perpetrator, type of relationship between them, prior history of domestic violence, previous institutional interventions (51).	5.20	4.21
Triangulation—Strategies to enhance triangulation across data collection systems, both at the national level, to enhance case detection, and at the regional level, to enhance comparability.	- Identifying a minimum set of variables covered that allow us to know the situation in Europe and make comparisons between countries (55). Triangulating monitoring systems data with newspaper articles, police and court statistics (59).	4.69	4.08
Qualitative follow up—Strategies to collect in depth information on every suspicious case in order to diminish underreporting and better understand the phenomenon.	- Developing qualitative research on motives, context and background of the cases in order to find out, if and how these crimes could be prevented (65).	4.56	4.11

Description of the clusters depicted in Fig 1. Examples of strategies and the average rating of strategies within the cluster. Corresponding numbers of example strategies are indicated in parenthesis.