Abstract

1. BACKGROUND FOR THE REVIEW
Over the years, growing attention has been given to the phenomenon of trafficking in human beings (THB). Human trafficking generally involves the use of force, fraud, or coercion to enslave people in situations that are exploitative and in many cases illegal and dangerous (GAO, 2007). The use of fraud, force, or coercion typically distinguishes THB from smuggling people. Victims of trafficking may be forced to work in prostitution, strip club dancing, sweatshops, agricultural businesses, and people's homes (GAO, 2007, Gervais, 2005; Kelly, 2005). Underage victims are forced to beg for money in cities, work in carpet shops and participate in pornography and sexual acts with adults. Furthermore, trafficking in children in the sports business, especially in soccer, is not uncommon (de Boer, 2002; David, 2005). Not all governments recognize trafficking as a problem. They may treat foreign trafficking victims as illegal immigrants and deport them back to their home countries, rather than protect them (GAO, 2007). However, in most countries, trafficking has been recognized as a national and international problem, and there is a widespread agreement for the need of a multilateral response on both levels (Laczko, 2005). The United Nations (UN) Protocol to prevent, suppress and punish trafficking in persons, especially women and children, supplementing the UN convention against Transnational Organized Crime (2000), stimulates anti-THB legislation and interventions in many countries all over the world. Furthermore, there have been a growing number of international conventions on human trafficking in the last decade as well as a vast increase in the number of publications on THB and on ways to prevent and suppress it (Kelly, 2005; Laczko, 2005).
Sexual exploitation is by far the most commonly identified form of THB, accounting for 79% of all cases, followed by forced labour with 18% (Chawla, Me & Pichon, 2009). A working paper of the International Labour Organization (ILO) supports this finding: 75% of the reported cases regard sexual exploitation (Belser, 2005). Still, caution must be given to these results due to the possible statistical bias, as will be mentioned below. Moreover, the fact that sexual exploitation is the most documented type of THB does not mean that there is an overall consistency in recognizing sexual exploitation. Organizations continue to face obstacles as they work on global and regional initiatives to combat trafficking (Barnitz, 2001). For example, governments disagree on whether there is a difference between ‘forced’ and ‘voluntary’ prostitution (GAO, 2007). Under-reported forms of exploitation are forced or bonded labour, domestic servitude and forced marriage, trafficking for the purpose of organ removal, and the exploitation of children in begging.
Much research has focused on the prevalence of THB, but no consensus has been reached on its incidence. In 2006, the United States Government estimated 600,000 to 800,000 persons being trafficked across international borders annually 1 . However, according to UN Children's Fund (UNICEF) and the ILO the number is much higher with approximately 2 million people being trafficked every year worldwide (Boonpala & Kane, 2002). With regard to registered victims, the numbers vary greatly as well. Italy, for example, accounts for a high number of reported victims in Europe 2 . In 2006, Italy reported 2143 victims of trafficking. The high number may possibly be the result of the extensive care for victims 3 . This can lead to a higher motivation for victims to denounce. These estimates are questionable due to methodological weaknesses, gaps in data, the interpretations made and the numerous discrepancies found in studies (Cwikel & Hoban, 2005; GAO, 2006; Tyldum & Brunovskis, 2005; World Congress against CSEC, 2001). In the absence of reliable numbers, stereotypes are often seen as being true. In addition, pressure groups, such as social services, can influence the image of trafficking. The issue has been sensationalized and politicized (Brennan, 2005), resulting in policies that are built on rhetoric and ideology rather than on evidence (Vermeulen, 2007). In reaction, organizations have intensified the collection of statistics and policy data. Nevertheless, in all probability only a small percentage of human trafficking is registered leaving a high dark number in its prevalence (BNRM, 2007).
Research on THB has not only focused on its prevalence but also on trends and developments, and on facts about traffickers 4 in order to understand the phenomenon. This understanding of the depth, the breadth and the scope of the problem is needed before any initiatives towards prevention and suppression can be developed (Chawla et al., 2009; Surtees, 2008). Research on conviction has also been done, where statistics have shown an increase in the number of convictions. However, most convictions still take place in only a few countries. According to Chawla et al. (2009), who studied THB in Europe, Asia, Africa and America two out of every five countries (41%) do not report any convictions of THB and 14% of all countries have no data available at all. Possible explanations for the lack of registration are that some countries pay little or no attention towards the phenomenon or are poorly prepared and equipped for dealing with THB (Chawla et al., 2009). The level of attention given to THB seems to lead to higher statistics. As more is known on THB, more awareness to the phenomenon is given by the criminal justice system. Consequently, more cases of THB are registered which in turn leads to higher statistics. A rise in prevalence is, therefore, not necessarily only the result of an increase in THB cases.
Many activities to combat trafficking have been initiated by numerous supranational 5 , international as well as national organizations. In general, these organizations assess the phenomenon and develop initiatives based on their findings. These activities can be distinguished in preventive, suppressive and victim support interventions. The specific goals of these interventions can be raising awareness, providing education and employment, changing the legislation, prosecution of perpetrators and empowerment of victims. These interventions aim directly at the at-risk population, victims or perpetrators, while others are more indirect, trying to create more awareness among social workers and policy makers. Furthermore, initiatives can combine several goals and activities. For example, in 2007 Terre des Hommes started, together with partner NGOs, a project 6 in 12 countries to ‘contribute to the development of effective policies and practices against trafficking in especially children, safeguarding and promoting the rights of boys and girls in Southeast Asia, Southeast Europe and Latin America’(Dottridge, 2010). This project uses a very extensive approach in preventing trafficking, involving four different components: a) capacity building of NGOs and media; b) awareness-raising and empowerment at local level; c) advocacy at national and regional level; and d) networking.
Much is written about these initiatives, but some areas have been neglected. Knowledge on ‘what works’ is in particular limited. Most publications are primarily descriptive, for example describing the hardship of or social assistance to victims. Others mainly aim at collecting trustworthy numbers to define the scale of the phenomenon (Kelly, 2005).
There has been relatively little independent 7 research that evaluates and assesses the effectiveness of counter trafficking policies, programmes, and various interventions (Chase & Statham, 2005; Laczko, 2005). This can be problematic since organizations evaluating their own initiative may have explicit or implicit political or practical agendas that could influence their conclusions - for instance by selecting or disposing of certain information (Vandekerckhove, 2003). It is possible that more or less weight is given to certain data due to the authority of certain key actors (Tyldum & Brunovskis, 2005). The individuals involved in human trafficking, whether they are the perpetrators or victims, are considered hidden populations where the size and boundaries remain unidentified (Laczko, 2005; Tyldum & Brunovskis, 2005). As human trafficking is illegal and mainly underground (BNRM, 2007; Boak, Boldosser & Biu, 2003) trustworthy data is difficult to collect resulting in conclusions that may be far from the truth. Deficient data tracking systems and methodologies for estimation and evaluation could increase the risk that programmes targeting this specific population will be inaccurate (Clawson, Williamson & Garrett, 2008; Kelly, 2002). Evaluation is important as evaluative knowledge on trafficking can be used to develop prevention techniques or policies (Dottridge, 2007a; Kelly, 2005). The United States Government Accountability Office reviewed documents of 23 U.S. Government funded anti-trafficking projects in Indonesia, Thailand and Mexico. It revealed that 21 of the 23 projects included one or more monitoring elements but only ten state how performance is measured. The majority lack a logic framework of monitoring that links activities to goals, indicators and targets (GAO, 2007). And even though the number of monitoring and evaluation studies is rising, it is believed that more scientific evaluation research is needed to ensure the effectiveness of the interventions developed, to help agencies achieve the results desired, and to enable more effective oversight and accountability (GAO, 2006).
Another frequently encountered restriction in the research on THB is the availability of only small samples. Often, this is due to the limited access to victims and perpetrators (Ennew, 2008; Laczko, 2005). Intrinsically, there is nothing wrong with small samples. If done sensitively a variety of methods can produce illuminating results. Nevertheless, often preference is given to a single method such as interviews or questionnaires, which are not considered appropriate in researching topics that are controversial or difficult to talk about. Furthermore, small amounts of data are sometimes pushed through numerical hoops that produce misleading results (Ennew, 2008) 8 . As a result, little (reliable) knowledge on effectiveness of interventions in this area is available (BNRM, 2007).
While evaluations of anti-trafficking interventions are scarce, such interventions seem to cause collateral damage (Boermans, 2009; Dottridge, 2007b; Limanowska, 2003). Anti-trafficking programmes can cause damage by putting restrictions (often unlawful) on young women's decisions to migrate or even to travel. For instance, refusal to issue a visa or to allow a young woman to enter the country is presented as an anti-trafficking measure (Limanowska, 2003). 9 In 2002, the UN High Commissioner for Human Rights issued a series of recommended Principles and Guidelines 10 . The third principle states that anti-trafficking measures “shall not adversely affect the human rights and dignity of persons, in particular the rights of those who have been trafficked…” (p. 3) thereby aiming to protect victims of trafficking against (more) damage by interventions. Guideline 3 provides more detail on this point and urges governments, intergovernmental organizations and NGOs to monitor and evaluate “the relationship between the intention of anti-trafficking laws, policies and interventions, and their real impact” and to distinguish “between measures which actually reduce trafficking and measures which may have the effect of transferring the problem from one place or group to another” (p. 7). According to Dottridge (2007c), the High Commissioner's Guidelines do not appear to have been heeded by many government agencies and NGO's involved in anti-trafficking activities. Nine years have passed since the endorsement of the UN Trafficking Protocol but little is known about which interventions have been the most effective in preventing human trafficking, protecting victims and prosecuting traffickers (GAO, 2007).
2. OBJECTIVES OF THE REVIEW
The background information yields a number of justifications for a Campbell Systematic Review on this topic. The growing attention to THB entails a demand for more information. The number of interventions to counter THB is rising, and many initiatives have been described. At the same time, the effectiveness of these programmes remains unknown. 11 However, the severity of the crime and the impact on its victims makes it of utmost importance to gain more insight into the working and effectiveness of anti-trafficking strategies 12 and interventions. Hence, the objectives of this systematic review are twofold. Firstly, this review will bring together and assess the available evidence on the effects of anti-THB strategies and interventions. This will contribute to the knowledge on anti-THB interventions and their effectiveness and will therefore provide information to policy makers. Secondly, this review will increase the knowledge about the strengths and weaknesses of research concerning anti-trafficking strategies and interventions that can stimulate future research and improve evaluations. Awareness will be raised on the need for more rigorous research designs that also shed light on possible collateral damage of interventions that otherwise may remain unknown due to insufficient and inadequate information (Dottridge, 2007c). This systematic review can fill the gap between what has been done and what has been learnt, in line with the views of Dottridge (2007a). He mentions that processes such as ‘institutional learning’, ‘sharing lessons learned’ and identifying ‘good practices’ are necessary. He states, “In the case of every substantial initiative to prevent trafficking, therefore, it is important that it should be evaluated. Whenever possible, the lessons from the evaluation should be published or made available to others conducting similar work. The fastest way of circulating information of this sort at the moment is to put it on a website, ensuring the title mentions ‘evaluation’ or ‘impact assessment’ (of efforts to prevent child trafficking), so that this is picked up by Internet search engines” (Dottridge, 2007a, p.66). Consequentially, this review aims at contributing to a more evidence-based approach in the prevention and suppression of cross border THB for the purpose of sexual exploitation.
The questions to be answered are the following: What types of anti-THB strategies and interventions that have been accompanied by some form of empirical analysis can be distinguished? Which of these analyses incorporate (quasi) experimental evaluations that are rigorous enough to determine the effect of these anti-THB strategies on preventing and suppressing THB? What are the outcomes of these (quasi) experimental studies?
3. METHODS
Studies will be included in this review based on the following criteria:
Types of studies: studies focusing on cross-border trafficking for the purpose of sexual exploitation will be collated. The focus will be on cross-border trafficking, because internal trafficking is not (yet) or just recently recognized in many countries. Cross-border trafficking is operationalized by following the definition of the United Nations Protocol to Prevent, Suppress and Punish Trafficking in Persons especially Women and Children, supplementing the United Nations convention against Transnational Organized Crime (2000), which has been signed and ratified by more than 100 countries, making it the most widespread definition used. Article 3 (a) of this UN Protocol states that “Trafficking in persons shall mean the recruitment, transportation, transfer, harboring or receipt of persons, by means of the threat or use of force or other forms of coercion, of abduction, of fraud, of deception, of the abuse of power or of a position of vulnerability or of the giving or receiving of payments or benefits to achieve the consent of a person having control over another person, for the purpose of exploitation. Exploitation shall include, at a minimum, the exploitation of the prostitution of others or other forms of sexual exploitation, forced labor or services, slavery or practices similar to slavery, servitude or the removal of organs”.
This review will be limited to trafficking for prostitution or sexual exploitation, in any form there is. Trafficking for forced labor or services, slavery or practices similar to slavery, servitude or the removal of organs will be kept out of consideration for several reasons. Firstly, the line between trafficking for labour exploitation and terrible working conditions is thin (de Jonge van Ellemeet, 2007) making it difficult to define situations as one or the other. Secondly, there are few - if any - studies in the area of trafficking for the removal of organs. These practices were either not recognized, or not recognized as a form of trafficking until included in the UN protocol. Finally, these areas in human trafficking take place in different parts of society and have their own dynamics. Therefore, they should be studied as distinct topics.
In this review studies on anti-trafficking measures will be included that involve evaluations of strategies - (policies) and interventions - to prevent or suppress cross border trafficking for the purpose of sexual exploitation, targeting both individual perpetrators and criminal groups, as well as (possible) victims, for example by informing and educating. Policies or initiatives exclusively regarding victim assistance, the reintegration of victims and arrangements for legal status, will not be included.
An inclusion criterion that will be applied in the second stage of the review is that studies must report the effectiveness of initiatives, supported with numerical data. Studies considering best practices or evidence-based practices on how to counteract THB will be included in this review.
Descriptions of good practices based on field experiences but lacking any numerical data will be excluded.
Participants: there are no exclusion criteria regarding participants (i.e. evaluation research dealing with initiatives targeting perpetrators and criminal groups as well as vulnerable individuals and professionals in the field of anti-THB will be included).
Publication: eligible studies are either published - electronically or in print - or unpublished. Studies from the year 2000 and onwards are incorporated in the review. This year was chosen since it marks the UN Trafficking Protocol.
Country of origin: In principle, studies from any country all over the world will be included. However, due to limited resources and knowledge of a limited number of foreign languages within the research team, only those studies that have been written in Danish, Dutch, English, French, German, Italian, Norwegian, Spanish and Swedish will be reviewed.
Methodological quality: All empirical (numerical) evaluation studies with respect to anti-trafficking interventions and strategies will be included. They will be categorized according to the Maryland Scientific Methods Scale (SMS) (Sherman et al., 1998) in order to identify and assess the strength of the evidence (Sherman, Farrington, Welsh & MacKenzie, 2002). The five categories of studies distinguished in this scale are: Post-test measure with no control or comparison groups Pre- and post-test measure with no control or comparison groups Pre- and post-test measure with control or comparison groups Pre- and post-test measure with control or comparison groups and including a statistical control Post-test measure with control or comparison groups and random selection to one of the two groups
According to Rossi, Lipsey and Freeman (2004), research on effectiveness of interventions should aim at least at a quasi-experimental design, corresponding with level 3 of the Scientific Methods Scale. This review strives to uphold this aim. However, we expect only a few studies - if any - with a design at this level.
Search strategy for identification of relevant studies
Several strategies will be used to identify all studies - published or otherwise - that meet the criteria described above. This includes keyword search of computerized databases. Additionally (existing) contacts working in this area will be asked for relevant material. Articles, books, reports, and conference papers will be retrieved, and an Internet search will be done. Special attention will be given to search and collect relevant studies captured in the so-called grey literature 13 .
Databases: Computerized bibliography searches will be conducted using different electronic databases.
14
Keywords and wild card terms
15
that will be used will involve words that describe: the subject of study (e.g. human trafficking, sexual exploitation, anti-trafficking) AND the interventions and programmes of interest (intervention, prevention, programme) AND research effectiveness (effect, evaluation, best practice) These keywords have been constructed in a preliminary review of the literature focusing on anti-trafficking initiatives.
16
This search strategy is broad to be certain that all relevant material is included in the preliminary search. The keywords are to be present in the title, subtitle and/or abstract in order to be eligible for this review and will be used to search Internet sites, electronic databases and libraries.
2BNRM Library: The Bureau of the (Dutch) National Reporter on Trafficking in Human Beings (BNRM) has a library with over 3,000 articles, books and reports related to human trafficking. Using their search engine (Reference Manager), all articles will be scanned for applicability by using the keywords.
3Existing contacts: Staff of relevant organizations will be contacted to provide the reviewers with any published or unpublished study. In addition, other personal networks will be consulted such as policymakers, researchers and contacts at international and supranational organizations.
4Cross-referencing of bibliographies: References in relevant review articles, primary studies and meta-analyses will be scanned for new leads. Only articles that contain the words listed in appendix II in the title or subtitle will be reviewed. To locate any grey literature, government reports as well as nongovernmental organization's reports, book chapters, policy documents, personal networks, and research organizations' websites will be cross-referenced.
5Internet searches: Websites of NGOs (e.g. Terre des Hommes, UNICEF and CATW), professional associations and organizations involved in applied and policy research will be searched. For this purpose a list of related NGOs available at BNRM will be used and supplemented
17
. In addition, keyword searches will be conducted using search engines such as google.com.
Description of methods used in primary research
Initially, the authors will search for evaluation studies individually but systematically by applying the inclusion criteria. Studies on all programmes and interventions designed to counter THB for the purpose of sexual exploitation accompanied by some form of outcome evaluation will be included. Whether evaluations are carried out by independent evaluators or by organizations involved in designing or performing initiatives will be accounted for. An overview will be made of all studies containing any (combination) of the relevant key words in their title, subtitle and/or abstract. A short summary will be given of each study to allow the authors to keep track of its value for the systematic review. When a final overview of all studies is compiled, the second stage will start where the authors will select the studies relevant for the review by examining full-texts. Studies that include numerical evidence will be listed. The third and final stage consists of selecting studies that evaluate interventions using an evaluation design of level 2 or higher of the SMS. Jointly, a consensus will be reached on which studies are applicable for this review.
A first glance at the present literature shows that the trend in evaluating and monitoring interventions in the field of trafficking is limited but expanding. However, structured studies on effectiveness, as we know for example from juvenile justice reviews 18 , are not present. So far, around 20 studies have been found that initially meet the criteria for this systematic review. Many of these concern evaluations by the same organizations that carried out or initiated the intervention. In addition, most interventions focus on raising awareness on THB, using campaigns to reach the goal. Effectiveness is measured by using questionnaires and interviews on the knowledge and satisfaction on the information campaigns. Consequently, these studies are descriptive rather than causal, containing only pre-test and/or post-test measurements. So far, no randomized controlled trials (RCTs) were found, nor any study of level 3 or 4 of the SMS.
Criteria for determination of independent findings
This systematic review will examine outcomes related to the effectiveness of anti-THB interventions. It is expected that studies may include different types of strategies or different study samples. Strategy and sample differences are taken into account in order to examine their respective impact. If several independent samples are presented in a single publication these samples and their outcomes are treated separately.
Details of study coding categories
A preliminary coding sheet has been developed for this review 19 . This sheet covers a series of key aspects of the study, such as research design, methodological quality and outcome measures. Furthermore, characteristics of the intervention will be coded such as the type of intervention, the population it is aiming at and the procedures used. At least two researchers will code all studies resulting from the initial screening independently. The principal researchers will resolve coding differences.
Statistical procedures and conventions
Effect sizes will be calculated using generally accepted standardized measures (Lipsey & Wilson, 2001; Rosenthal, 1991). These calculated effect sizes will help determine whether studies have found positive, negative or no effects. If possible – that is if we find eligible studies - meta-analytical approaches required to combine studies will be used (Lipsey & Wilson, 2001).
Qualitative studies
It is expected that due to the limited number of adequate evaluations, if any, and its descriptive nature, at best descriptive statistics can be calculated on the nature of the intervention, logical framework, evaluation methods and reported outcomes. These results will be discussed separately as they do not include effect sizes. Instead, a narrative review will be made on these studies to highlight the current landscape of evidence on the evaluations of anti-trafficking interventions. This narrative review will also give insight in the critical research areas, gaps in the evaluation studies and the problems that are associated with doing research on THB.
4 TIME FRAME
5 PLANS FOR UPDATING THE REVIEW
This review will be updated every five years to include new evaluation studies on anti-THB initiatives in any country. A couple of years will be needed for researchers to take note of this review and allow them to evaluate the effectiveness of such interventions.
6. ACKNOWLEDGEMENTS
We would like to thank the Campbell Collaboration (C2) in Norway for their financial support. We are also grateful for the support given by the BNRM and WODC by allowing us to search through the library, to make use of their personal contacts and help in any way possible to make available the information needed for this systematic review. Furthermore, we would like to thank Peter van der Voort from the Netherlands Institute for the Study of Crime and Law Enforcement (NSCR) for his expertise in searching relevant studies.
7. STATEMENT CONCERNING CONFLICT OF INTEREST
There is no conflict of interest present. The Bureau of the (Dutch) National Rapporteur on Trafficking in Human Beings (BNRM) and the Research and Documentation Centre (WODC) are not directly involved in policy development on human trafficking.
Footnotes
ANNEX I
ANNEX II
ANNEX III
ANNEX IV
1
In the US, cross border trafficking is defined as the trafficking of humans between countries. Trafficking across and within states is referred to as internal trafficking (GAO, 2006).
2
International Seminar: Anti-trafficking actions and Human Rights based approach in South Asia: Outcomes and links with Europe. Final seminar of the Terre des hommes consortium project DDH/2—4/089-105, Brussels, 24th-25th February 2009. Comment of ms. Maria Grazia Giammarinaro, policy officer. DG JLS; Justice, Freedom and Security European Commission.
3
All victims of trafficking in Italy are placed in social integration programmes and also receive police protection. See Commission Working Document. Evaluation and monitoring of the implementation of the EU Plan on best practices, tandards and procedures for combating and preventing trafficking in human beings. Commission of the European Communities. COM (2008) 657 final. Brussels, 17.10.2008.
4
For instance, a disproportionately high number of women are involved in THB. They can be either victims or traffickers. This is important to note, especially in cases where former victims have become the perpetrators (Chawla et al., 2009).
5
For example Terre des hommes, Save the children and UNICEF.
6
Title of this project is Enhancing capacity to address trafficking in especially children from a human rights perspective in Southeast Asia, Southeast Europe and Latin America.
7
Here, independent research regards research that is not carried out by the same organization that has developed or carried out the initiative in the first place.
8
For example, data restricted to only one research method are used for analysis and percentages of a small, unrepresentative sample may be used by policy makers in designing programmes for the general population (Ennew, 2008).
9
Victims may also experience damage by being held in a police cell or during interrogation, whereas cultural differences can further contribute to the deterioration of physical or medical conditions (Zimmerman et al., 2003).
10
11
For example, at least 44 studies on human trafficking are added to the electronic library of Terre des homes in February 2009, and 82 in March 2009. None of these studies are evaluations of anti-trafficking measures.
12
Strategy is collective term referring to multiple interventions.
13
Grey literature consists of articles, documents, newsletters, reports and papers that cannot easily be found, are unpublished, or not available through traditional commercial publication channels (Weintraub, 2006).
14
See Annex I: List of electronic databases.
15
For example: ‘sex*’, ‘traffick*’ and ‘evaluat*’.
16
See Annex II: List of keywords.
17
See Annex III: List of relevant websites.
18
19
See Annex IV: Coding Sheet.
20
* Currently unavailable
