This project employs a mixed methods approach using both quantitative and qualitative methodologies, and consists of four components: 1. literature review; 2. telephone interviews and focus groups; 3. survey; 4. online evaluation study. All the four target groups will be included in each data collection component.
Several strategies will be utilised to maximise participant recruitment. Health professionals will be invited to participate in this project via articles published in their professional organisations/associations' bulletins/newsletters. The researchers will access events in Northern Ireland and the Republic of Ireland where nurses and GPs will attend to invite them to participate in this project, this will include the following: health trust staff meetings; special interest groups; classes with postgraduate nurses at the researchers' universities; conferences and workshops. Interested health professionals will contact the researchers and will be screened for the selection criteria. The inclusion criteria include: currently employed in one of the target clinical areas (as reported by the participants) and willing to participate. The exclusion criterion will be not able to provide informed consent. Eligible participants will provide informed consent. A project website was developed to support the project and will provide information for participants including e-mail address, telephone mailbox, information sheets, and will host the online survey and online evaluation study (http://www.science.ulster.ac.uk/weightcareproject).
1. Literature review
The purpose of the literature review is to explore the role of health professionals in managing obesity through spontaneous intervention in a variety of health promotion settings. Although the gold standard review is a systematic review, which includes only randomised controlled trials (RCTs), for the purposes of this project and to achieve the comprehensive relevant literature, a systematic approach will be adopted to include studies with all designs. A systematic search of the literature to locate studies will be conducted using the following electronic databases: CSA Illumina, Cochrane Library, Communication Abstracts, EBSCO Host CINAHL, ISI Web of Knowledge: Web of Science, OvidSP Embase, OvidSP Medline, OVIDSP PsychINFO, and PubMeb Central (within the last 10 years, 2000 to 2010). To obtain the comprehensive relevant literature, no studies will be excluded on the basis of study design, outcome measures or type of intervention. Study quality will be critiqued. References from the articles will also be reviewed. The findings from this review process will contribute to and confirm the methodologies of this project.
2. Telephone interviews and focus groups
The purpose of the telephone interviews and focus groups are to gain in-depth insight into the views of health professionals regarding the attitudes, current practices/behaviours and knowledge of assessing body weight status. These discussions will be centred on attitudes, current practices/behaviours and knowledge of health professionals in assessing body weight status amongst their patients.
Quantitative and qualitative methodologies will be employed using quantitative telephone semi-structured interviews with GPs and focus groups with nurses. This design is based on the researchers' experiences of obtaining in-depth information from GPs and nurses.
A stratified convenience sample size will be used but will ensure representation from both Northern Ireland and Republic of Ireland. In total there will be 16 focus groups conducted. There were approximately 84,922 registered nurses actively practicing throughout Ireland in 2008 with 68,614 in the Republic of Ireland  and 16,308 in Northern Ireland [20, 21]. According to the Nursing Board registered statistics for 2008, there are 3,040 public health nurses in the Republic of Ireland . The numbers of doctors registered on the specialist division of General Practice (GP) in 2008 was 1626 in the Republic of Ireland  and 1156 in Northern Ireland . At the time of writing, there were 35 Clinical Nurse Specialist posts approved in Occupational Health and one Advanced Nurse Practitioner post approved in Occupational Health in the Republic of Ireland . The only figures available for occupational health nurses in Northern Ireland is that there are two currently registered as members with The Association of Occupational Health Nurse Practitioners (UK) . To obtain approximate proportional representation, 12 focus groups will be conducted in the Republic of Ireland and four in Northern Ireland. There will be eight participants in each focus group, thus 128 nurses are required to participate in the focus groups. This meets the recommendation that a focus group should consist of between four to eight participants . For each focus group, 12 participants will be recruited to achieve at least eight participants, thus a total of 192 nurses will be recruited. Telephone interviews will be conducted with 16 GPs (8 from Northern Ireland and 8 from the Republic of Ireland).
A questionnaire will be developed for the telephone interviews with GPs, which will be quantitative-based. These interviews will be conducted at a time of the GP's convenience. Focus groups will be conducted during/after conferences/workshops and staff meetings in the health clinics/centres, hospitals or universities, convenient for the nurses. Example questions for both the interviews and focus groups will include 'outline your experience of working with people who are overweight/obese?' and 'what are the ways which you measure body weight status and also what have been the issues in using these measures? Different scenarios of overweight or obese adults and children will be discussed. All focus groups will be recorded.
The themes and issues from the interviews and focus groups will be collated and then explored further via developing a questionnaire for the survey. A selected sample of the participants from focus groups will meet on a second occasion to pilot the survey.
This survey aims to determine the attitudes, current practices/behaviours and knowledge of assessing body weight status among health professionals in Northern Ireland and the Republic of Ireland.
Survey using a questionnaire, primarily online but also will be made available as required in paper-based format.
From previous research by a team member (KM), the usual response rate for online surveys with health professionals varies but is approximately 50%. Sample size was calculated using a confidence level of 95%, confidence Interval of 5 with the target population of approximately 88000 in total (previously described), giving a sample size of 382. Based on an estimated 50% response, 764 participants will be recruited for this survey. GPs and nurses will be recruited proportionally within Republic of Ireland and Northern Ireland (i.e. 4:1 for nurses and also for GPs, 1:1, respectively).
The questionnaire will ask the health professionals questions on body weight status amongst both adults and children. This will include: the current views on assessing body weight status; the extent to which body weight status is currently assessed, and if assessed how it is measured (tools/scales), how accuracy is determined/assessed; and the health professionals' understanding of what constitutes healthy and overweight/obese body weight statuses; and the extent of continuous professional development. The duration of years of clinical experience (date of qualification) will be recorded to determine if there are any differences in years of experience. In addition, issues will be explored relating to how health professionals communicate obesity messages in managing obesity with other health professionals and with patients (adults and children including parents, and their families).
Health professionals will complete the questionnaire on one occasion. Health professionals that do not have access to the internet and who indicate willingness to participate in this project will be forwarded a hard copy of the questionnaire by post. In addition, the researchers will go along to meetings/conferences/workshops attended by the health professionals and will ask them to complete the questionnaire (online or hard copy) during and/or at the end of the event.
4. Online evaluation study
The primary objective of the online evaluation study is to determine if health professionals can identify the body weight status of adults and children correctly and if there is a significant difference between the responses from the health professionals and the expert responses (i.e. researchers' responses).
Online evaluation study consisting of a novel approach of a video of images with different body weight statuses as a basis for a series of questions.
For purposes of feasibility and limited time, a sample size for one group was calculated, which included all the target health professionals groups in both Northern Ireland and the Republic of Ireland. This sample size was calculated using GPower 3.0.10  with the level of significance set at 0.05 and 80% power using a 2-tailed t-test. This was calculated using data from a US study that 25% of GPs failed to recognise their patients were overweight . The power calculation indicated a total sample size of 128 participants. Taking into account a drop-out rate of approximately 20%, in total at least 154 participants (nurses and GPs) will be recruited across Ireland.
Development and validation of DVD/video
For the purposes of this project, a DVD/video will be developed, which will be used to assess the ability of health professionals in Northern Ireland and the Republic of Ireland to recognise overweight and obesity in adults and children. The DVD/video will consist of series of 20 case studies (adults and children), which each image will rotate by 360°. The DVD/video approach was chosen instead of a validated method such as silhouettes because it represents an innovative tool, which will be both a practical and feasible method for health professionals to assess body weight within the allocated timeframe. The DVD/video will aim to construct a real-life health professional-patient consultation within Ireland. The DVD/video will be interactive, with movement, and based on real people, features that have not been included in previous methods. The case studies will be based on volunteer models of various ages (children <18 years; adults 18-65 years; older adults >65 years), gender (female/male), body weights and heights to provide a range of BMIs. Body weight status will be based on the WHO's BMI classification  (Underweight, BMI < 19.9 kg/m2; normal weight, BMI 20-25.0 kg/m2; overweight, BMI 25.1 - 29.9 kg/m2; obese BMI >30.0 kg/m2) with the International Obesity Taskforce (IOTF) cut-offs for BMI [17, 18] being used to determine body weight category for case studies <18 years.
A pilot/validation online evaluation study in a form of a focus group will be conducted prior to the main online evaluation study. The aim of this validation/pilot study is to determine if the online study is functioning properly and collecting the required data, checking for timing, clarity and nagaviation of the videos and questions, and to compare the new tool with an existing validated silhouette tool. Within the focus group, a convenience sample of 30 (20% of main study) health professionals will complete the online evaluation study and then provide feedback to the researchers. The responses from the health professionals i.e. measurements from the real-life case studies will be compared with the validated silhouettes (using paired t-tests, SPSS) to determine if there are any significant differences between the two tools.
Participants will complete the online evaluation study on one occasion. This will consist of the participants being shown each case study one at a time and in a random order and will be asked to complete a series of questions. Participant responses will be assessed to determine the extent to which health professionals are able to identify overweight/obesity and questions will be included, which will also evaluate their understanding of how to assess overweight/obesity. It is envisaged that it will take participants no more than 45 minutes to complete this online evaluation study.
To ensure that each of the target health professional groups from both Northern Ireland and the Republic of Ireland are represented, those who do not have internet access will have an opportunity to complete this online study at meetings/conferences/workshops. The researchers will attend meetings/conferences/workshops with laptops for participants to complete this online evaluation study.
The recordings from the focus groups will be transcribed independently. The data generated from the focus groups will be analysed and responses will be grouped into themes and key issues using content analysis of the transcripts [28–30].
Quantitative data from the interviews, online survey and online evaluation study will be analysed using SPSS. Summary statistics (descriptive and frequencies) and inferential statistics will be conducted, as appropriate. Following the test for normality, if showing normal distribution of data, t-tests/analysis of variance and correlations will be conducted to determine any significances and relationships in the data. Paired t-tests will be conducted using the data from the online evaluation study to determine if there is a significant difference between the responses from the health professionals and the expert responses. If the assumptions for the above parametric tests are violated then the appropriate non-parametric tests such as the Mann-Whitney will be used.
As this is an all-Ireland project, ethical approval was obtained from six ethical committees in both Northern Ireland and the Republic of Ireland, these were: School of Communication, University of Ulster; Office for Research Ethics Committees Northern Ireland (ORECNI); Belfast Health and Social Care Trust; National University of Ireland, Galway; University College Hospital Galway; Irish College of General Practitioners. There is a Project Steering Committee who will monitor this project.
The key ethical issues in this project are informed consent, participant's confidentiality and data protection, as according to good clinical practice guidelines. All the participants in each study will receive information following an appropriate cooling-off period (at least one week) and with full understanding provide informed consent. Participants' privacy and confidentiality will be maintained during the data collection and all participants' information will be treated confidential as per the Data Protection Act (1998) . To protect participants' confidentiality, each participant will be assigned a study identification (ID) number. The online questionnaires will be accessed using passwords provided.
Written protocols for (a) management of distress should the models, particularly the child models, become distressed; (b) recording of and safeguard of the distribution of the DVD/video; and (c) filming procedures have been compiled. Each model will be filmed individually. The filming will be conducted in a confidential and comfortable setting.