Menu ENN Search

Meeting demand peaks for CMAM in government health services in Kenya

By Regine Kopplow, Yacob Yishak, Gabrielle Appleford and Wendy Erasmus

Regine Kopplow is a Global Nutrition Advisor with Concern Worldwide. She previously worked in various roles in nutrition programmes in Afghanistan, Malawi and Nepal for Concern Worldwide and in Somaliland and South-Central Somalia for UNICEF.

Yacob Yishak is the Health and Nutrition Programme Director of Concern Worldwide Kenya. He is responsible for the overall coordination of technical and managerial functions of the programme. He has worked with Concern for the last five years in nutrition programming, assessment and research and conducted a number of national and regional trainings in nutrition and mortality assessment. He is a Master trainer in SMART methodology and is the Health and Nutrition Programme Coordinator for Concern Kenya.

Gabrielle Appleford is a freelance consultant working with Concern Worldwide Kenya on knowledge management. She has a technical background in public health and has worked with various organisations on health and nutrition programming in the East Africa region and more widely. She is based in Nairobi, Kenya.

Wendy Erasmus is Concern’s Country Director in Kenya. She is a specialist in mother and child health in developing contexts. Her career in international emergency and development work spans more than twenty years, six of which have been with Concern. She has worked in South Sudan, Rwanda, Burundi, DRC, Somalia and Kenya amongst many others.

Concern Worldwide would like to thank ECHO for their support for the CMAM surge model.

Location: Kenya

What we know: There is a need to provide services for acute malnutrition management within government-run health systems. It is a challenge to respond effectively to seasonal, as well as emergency-related, increases in malnutrition as they arise. NGO led services are a typical default response to deal with increased caseload in emergencies, often running in parallel to government systems. Capacity development of government services may be viewed as a ‘luxury’ of development.

What this adds: A model to provide surge support for CMAM, to meet peaks in demand for nutrition services provided through government health systems, is being piloted by Concern Worldwide with District Health Management Teams and health workers in Marsabit County, Kenya. It involves risk analysis, threshold setting, monitoring against thresholds, provision of surge support and scaling down of surge support at health centre level. Small scale surge support was ‘triggered’ 11 times by health workers at pilot health facilities between January and September 2013. Surge support included provision of extra staff, relocation of supplies, and more supportive training and supervision. Regular revision of thresholds to respond to contextual challenges and the need for flexible local decision-making are two important factors for success of the model. An evaluation will take place in 2014.

Meeting demand peaks for CMAM in government health services in Kenya

The humanitarian community and national governments increasingly recognise that early warning and response are more effective and less costly than late response. In practice, the relationship between warning and response often remains tenuous. Early warning in the 2010/2011 food crisis in the Horn of Africa did not lead to early action and resulted in loss of livelihoods and lives1. Concern Worldwide (Concern), who were part of the humanitarian response in the arid and semi-arid lands (ASALs) of northern Kenya, used learning from the delayed response to develop a model of support for community-based management of acute malnutrition (CMAM). This article describes the CMAM ‘surge model’ and its application in Marsabit County by Concern and the Government of Kenya (GoK)2. The model builds upon Concern’s experience implementing CMAM3 in emergency and development contexts more broadly and is informed by the organisation’s experience in health system strengthening through its child survival interventions4.

Background on CMAM

CMAM was adopted as international best practice by the United Nations in 20075 and is being implemented in 60 countries worldwide including Kenya6. Although spikes in acute malnutrition are often precipitated by humanitarian emergencies, there is growing recognition that a considerable portion of the global acute malnutrition (GAM) burden exists outside the spotlight of declared emergencies. There is, therefore, a clear need to provide services for acute malnutrition within government-run health systems and to respond effectively to seasonal, as well as emergency-related, increases in malnutrition as they arise.

While services for acute malnutrition, particularly severe acute malnutrition (SAM), have been integrated to some degree into government health services, emergency nutrition responses often run parallel to health systems. They use ‘start-stop’ modes of engagement, triggered by fixed prevalence thresholds for SAM or GAM7. Interaction is often perfunctory, enlisting government health facilities and health workers in externally driven and defined humanitarian responses. Rarely is existing health system capacity acknowledged or built through these interactions8. Within this mode of engagement, health systems strengthening (HSS) may be viewed as a ‘luxury’, suitable only for periods of non-emergency when there is less stress on health services, and using development funding or government resources.

Contextualising the CMAM Surge Model

In 2010 and 2011, the Horn of Africa had two consecutive seasons with below-average rainfall, resulting in one of the worst droughts in 60 years. This put 12 million people in Kenya, Somalia and Ethiopia in urgent need of humanitarian assistance9. In Kenya, this mainly affected the ASALs. In the ASALs, the effects of drought related food insecurity are manifested in high maternal and child malnutrition. Underlying factors which contribute to high levels of malnutrition in these areas include pre-existing chronic and acute food insecurity; poor dietary diversity; poor child care and feeding practices; poor hygiene and sanitation; limited infrastructure, poor health service delivery and market integration; as well as sporadic conflict. Concern was part of the humanitarian response in Marsabit County and was the lead non-governmental partner for health and nutrition in Moyale, Chalbi and Sololo districts10.

In most of the affected districts of the county, the emergency response was initiated after the GAM rates were above 20%11.  Despite this, the response was successful in addressing malnutrition through static and outreach provision of health and nutrition services. Post analysis of the response by Concern and District Health Management Teams (DHMTs) revealed that there was a lack of pre-emergency planning (despite slow onset of the emergency and early warning), limited use of available data and contextual analysis and limited understanding of how and when to scale up interventions. Conclusions drawn at the time indicated the need to establish:

In response to lessons and the rallying call for a new design framework for CMAM programming12, Concern and the DHMTs developed the ‘CMAM surge model.’

The CMAM Surge Model

Model principles

The CMAM surge model is premised on one of the fundamental principles of CMAM, that early detection of malnutrition leads to improved treatment outcomes and fewer cases of SAM, as children are treated before their malnutrition becomes severe. The model affirms that strengthening the capacity of the health system to manage better spikes in demand for services is essential to ensuring quality health services and health systems in the longer term. The model aims to:

Strengthen the capacity of government health systems to effectively manage increased caseloads of malnutrition during predictable emergencies without undermining the health system, the provision of other services and on-going systems strengthening efforts.

The CMAM surge model prepares the health system to plan for, detect and respond efficiently to spikes in MAM and SAM prevalence and caseload; while it does not prevent malnutrition, it does trigger early action and community mobilisation. It responds to the call for a new design framework for CMAM programming, one that employs capacity-based response thresholds that trigger support based on existing health system capacity; this is reflected in Figure 113.


Over time, through such an approach, it can be expected that health system capacity to manage spikes in cases of acute malnutrition would improve; this would be reflected in revised upwards capacity thresholds and allow for increased attention to other aspects of service delivery, coverage and quality. The model presupposes that there is some existing health system capacity and local commitment (of managers and health workers) to HSS. Without base capacity and commitment, the health system could potentially be in permanent ‘surge’ mode, leading to direct service provision by an external agency with no exit strategy in place. Box 1 reinforces the underlying requirements of the model.

Box 1: Surge model underlying requirements

The CMAM surge model is appropriate for contexts where:

Surge components

The surge model contains a series of components, which align with and reinforce the WHO’s health system building blocks14. These are outlined in Table 1. The capacity of a health system to cope with increased needs for curative care for any disease or condition is a key aspect of HSS. It is also a means of promoting preparedness under a broader DRR framework, especially in areas where populations live in a chronic state of food and nutrition insecurity.

Table 1: Health system building blocks and surge components
Building Block Surge components
Service delivery Pre-defined and agreed surge package and delivery modality
Health Workforce Capacity building of health workers and managers on CMAM and the surge model; pre-defined and agreed ‘drawn down’ plan for additional human resources for health
Information Threshold setting, monitoring, timely communication and triggering (data analysis for triggering response)
Medical products and technologies Pre-positioning of therapeutic foods, essential medicines and equipment

Costed surge plan, funding modalities identified and in place prior to an emergency

Leadership and governance Reinforce mandated ‘systems’ and supportive roles (DHMTs, health workers, NGOs, communities, etc.) Government health managers and health workers in the ‘driving seat’

Surge components

Figure 2 provides a visual representation of the components of the surge model. The figure has been presented as a cycle given the chronic nature of food and nutrition insecurity in the ASALs, due to both seasonal peaks and drought-related ‘nutrition’ emergencies. Steps in the cycle are as follows:

A nomadic family in a small settlement close to Kalacha

1. Risk analysis: Facilities implementing the surge model analyse the drivers of increased caseloads of acute malnutrition in their contexts. The intention is to facilitate an understanding of what is considered a ‘normal’ caseload and why, when, and to what degree, spikes occur. Both supply and demand side factors are considered as part of this. These range from seasonal impediments to health seeking behaviour, such as women’s workloads or festivals, to health ‘systems’ issues, such as absent health workers or a lack of commodities. All factors are triangulated to estimate the expected caseload over the year under different conditions and should be reflected in the caseload seen at the facility. Trends may be quite localised, therefore analysis should be conducted with the staff and key community informants at each facility.

2. Threshold setting: Thresholds are developed to indicate a critical number of monthly cases at a health facility, above which the type and scale of support changes. These thresholds are defined by the staff at each health facility and should be based on their capacity to respond to increasing health and nutrition needs. Caseload records (SAM, MAM, malaria, pneumonia, diarrhoea, etc.) of the previous months can help in defining realistic thresholds, as well as drawing from staff experiences during times when service needs exceeded available resources or capacity.

3. Monitor against thresholds: Caseloads are monitored and compared against thresholds on a monthly basis. This is done using hand drawn wall charts. Once a threshold is exceeded, the health facility informs the DHMT, mobilises its own resources, and, if needed, requests additional support, based on a pre-defined and jointly agreed package. This support should enable the facility to cope with an increasing number of patients without compromising the quality of health services.

4. Provision of surge support: The type and level of surge support, and how and when it is scaled up and down, is formally agreed at district level prior to implementation of the model. Surge support is only meant to come in once local resources are mobilised and efficiently used, to fill in the additional gap due to a deteriorating situation. This will allow routine health services to continue without compromising the quality or type of services. Figure 3 outlines the flow of support within the model.

5. Scaling-down surge support: Once the caseloads are reducing, support is gradually scaled down until it reaches the pre-surge level. Figure 4 provides a visual representation of the scaling up and down mechanism. Support is triggered by the health worker who is closest to the clients and community.

Application of the CMAM Surge Model

The CMAM surge model is being piloted with DHMTs and health workers in the three districts of Marsabit County - Moyale, Chalbi and Sololo. Activities commenced in May 2012 and continue to date, and are being implemented in 14 health facilities across the three districts. Implementation of the model is part of a larger ECHO funded project. Initiation of the model involved pre-defining the surge support package and agreeing on roles and responsibilities, through formal agreement, between Concern and the respective DHMTs. While these aspects of the model are not featured in Figure 2, the parameters of external support15 need to be set at the initial stage of implementation and require only periodic review.

Risk analysis: Health facility personnel and DHMT members were supported to identify factors contributing to caseloads of malnutrition seen in the 14 facilities (note, this does not necessarily correlate with caseload in the community). In the context of Marsabit, the following factors were identified: rainfall, conflict, population movement, workload of households and festivals. Stakeholders then developed graphs of recorded caseloads for children with diarrhoea, pneumonia and severe and moderate acute malnutrition16, and were trained to interpret contextual factors and relate these to observed number of cases. Through this process, health workers could then better understand which factors increase prevalence of acute malnutrition and which deter health seeking behaviour; from this understanding, spikes in caseload could be predicted.

Health workers also developed an appreciation of the importance of coverage of services and the need to investigate deviations in anticipated caseload. For example, seasonal peaks are expected in July at the onset of the rains when several factors overlap: 1) the number of diarrhoea cases increases, 2) the workload, particularly for women, increases due to agricultural activities, and 3) most households run out of food stocks. Health workers appreciated the need to investigate with the community reasons for any deviations from anticipated caseload during this period. For Marsabit stakeholders, the risk analysis was considered a real ‘eye opener’. It gave them better predictive skills over future events and an understanding of causal factors. The process was so enlightening that the DHMT in Sololo conducted a similar exercise for all health facilities in the district.

Threshold setting: Health personnel were then supported to define capacity thresholds based on their analysis of their own ability to respond to an increase in health and nutrition needs. Caseload records for MAM, SAM, diarrhoea and pneumonia from the previous months assisted in defining realistic thresholds, as well as drawing from past experience. Capacity has multiple factors – the total number of human resources for health, individual qualifications as well as motivations, equipment, supplies, community support, etc. As a result, threshold levels need to be defined by facility. These were then mapped against four phases - normal, alert, serious and emergency. In the case of Marsabit, thresholds were set for both MAM and SAM.

Monitor against the threshold: Monitoring is done on a monthly basis using prepared wall charts to plot caseloads for diarrhoea, pneumonia, MAM and SAM. Data are extrapolated from facility reports, the “source” documents for the Health Management Information System. This exercise does not take long given that the data are already compiled. The thresholds are placed beside the graph and immediately used to compare the recorded cases. In the case of Marsabit, the health facility staff have found the monitoring of caseloads against the thresholds to be an easy task, one which does not take much time but generates crucial insight. The health staff appreciate that they are in the ‘driving seat’ and that they decide when to request additional support. While the response trigger is SAM and MAM in Marsabit, any disease or condition could be used. Figure 5 presents one facility’s event calendar and monitoring data.

The process of regular plotting of admission data against the threshold enables health workers to track even slight changes in their context over time. It allows for gradual intensification of support as and when this is required based on a pre-agreed package. The model therefore promotes data for decision making at facility level and system efficiencies, as external resources serve gap filling requirements for discrete periods of time only. An additional component of the model, one that does not take place at facility level, is community engagement. How effective this component is has significant implications for facility-based thresholds, the accuracy of trend analyses and supply- and demand-side factors related to service utilisation17. Concern is currently testing a community-based surveillance system in order to ensure that trends at health facility level are reflective of the situation in the community. The surveillance system operates through Ministry of Health defined community units – Community Health Committees, Community Health Extension Workers (CHEWs) and Community Health Workers (CHWs).

Figure 5: Event and caseload graphs

Proof of concept: Conditions in Marsabit County have recovered since the 2011 drought mitigating the need for ‘emergency’ surge support at scale. However, the model has been ‘triggered’ 11 times by health workers at pilot health facilities between January and September 2013; in one instance, this reached the emergency threshold level. Box 2 provides details on this event.

Box 2: Exceeding the emergency threshold in Debel health centre

Debel health centre is situated in Moyale district and serves a population of approximately 7,500, including 1,400 under five children and 1,800 women of reproductive age. The facility is staffed by one nurse supported by two CHWs. In May 2013, MAM cases exceeded the emergency threshold set at 30 new admissions (actual cases = 35). This triggered surge support from the DHMT and Concern. Support included the transfer of a CHEW and secondment of a nurse from the district hospital, the provision of weekly on-the-job training and supportive supervision by the DHMT and Concern, the reallocation of supplies and equipment from another health facility as these were insufficient, and community mobilisation and outreach clinics to the more distant communities. Analysis of the factors contributing to the increased caseload included the following:

Surge support was gradually reduced and ceased altogether once the caseload returned to normal. The response had the additional benefit of securing a CHEW for the facility on a permanent basis and the repair of broken equipment (a mother and child scale).


Funding modality

The preparation or set up of the surge model was covered by routine funding secured to support MOH in providing CMAM and general HINI18 services. Concern’s CMAM support to MOH was mainly funded by UNICEF, while ECHO funded the model development. The setup was low cost, involving a centralised workshop of 1- 2 days to introduce the model to MOH at county and district level. In this programme example, the health facility level model setup involved two on-the-job training/supportive supervision visits at each health facility. The first visit covered the risk analysis and the second one the setting of thresholds. The model progress was monitored during routine supervision/on the job visits under the CMAM support to MOH, therefore no extra costs were involved.

In preparedness for a large scale up, Concern has estimated what it would cost to scale up each single surge element for one facility for one month and assumed that a specific percentage of months and facilities would require this support in a normal year. To enable large scale up/surge, flexible funding models for integrated CMAM services are required. Donors are showing interest in providing stand-by funds as long as the modalities for their mobilisation is clear and agreed in advance (which this model provides).

Lessons learned

The model will be evaluated in 2014 as part of its ‘proof of concept’ so that it may be scaled up or replicated in other ASAL counties. Lessons learned to date include the following:

Lessons learned to date and those emerging from formal evaluation will be taken into account in the model’s evolution. Watch this space!


Health systems are intended to be flexible systems, able to expand and contract as need requires. Making health systems ‘disaster proof’ should be an aim of all HSS initiatives and is a true reflection of an able system. Given the predictable nature of humanitarian ‘nutrition’ emergencies and seasonal spikes in malnutrition in the Kenyan ASALs, localised capacity is essential. This will require external agencies, such as Concern, to work differently. Government health managers, for their part, will also need to work differently; their pro-active and effective leadership remains crucial both during and after emergencies The CMAM surge model serves as an effective approach for realigning government and non-governmental roles, those of external agencies and health system’ stewards and operators, for more effective and cost effective provision of CMAM, allowing services to reach more people, at the right time and in the right quantity.

For more information, contact: Regine Kopplow, email:

Show footnotes

1Disasters Evaluation Committee, January 2012. DEC Real Time Evaluation – East Africa Crisis Appeal, Synthesis Report.

2The Ministry of Health domesticated the CMAM approach for Kenya. This is referred to as the ‘Integrated Management of Acute Malnutrition’ or IMAM.

3Concern currently supports CMAM programmes in Chad, Ethiopia, Haiti, Kenya, Malawi, Niger, Rwanda, Sudan, South Sudan and Uganda.

4Concern has successfully implemented Child Survival programmes in six countries to date: Bangladesh, Rwanda, Burundi, Haiti, Niger and Sierra Leone. In 2012, Concern initiated a Child Survival Programme in Kenya.

5WHO, WFP, UNSCN and UNICEF (2007), ‘Communitybased Management of Severe Acute Malnutrition: A Joint Statement by the WHO, WFP, UNSCN and UNICEF’, World Health Organisation: Geneva, Switzerland.

6UNICEF, 2013. Global SAM Management Update, Summary of Findings, Nutrition Section, Programme Division, UNICEF New York.

7P. Hailey and D. Tewoldeberha, Suggested New Design Framework for CMAM Programming, Emergency Nutrition Network, 2010, issue 39.


9The World Bank, Africa’s Pulse, An analysis of issues shaping Africa’s economic future, Vol. 7, April 2013, Washington DC.

10Marsabit County came into existence in 2013 as part of devolution under Kenya’s new Constitution; this also saw the dissolution of districts. The county is presently divided into four constituencies: Moyale, North Horr, Saku and Laisamis. For the purposes of this brief, the term district is retained given that it references the model’s application under district administrative boundaries and teams.

11Save the Children and Oxfam, 2012, A Dangerous Delay: the cost of late response to early warnings in the 2011 drought in the Horn of Africa.

12P. Hailey and D. Tewoldeberha, Suggested New Design Framework for CMAM Programming, Emergency Nutrition Network, 2010, issue 39.

13Adapted from P. Hailey and D. Tewoldeberha, Suggested New Design Framework for CMAM Programming, Emergency Nutrition Network, 2010, issue 39.

14World Health Organisation (2007). Everybody’s Business: strengthening health systems to improve health outcomes (WHO’s Framework for Action), WHO, Geneva.

15The model does not presuppose that external non-govern mental support is required, hence its absence in the model.

16Malaria was not selected as it is not endemic in the area

17Community engagement can also influence supply-side factors of health care provision such as staff attitudes, their availability, etc.

18HINI is a package of interventions proven to reduce mortality rates. It includes management of acute malnutrition, vitamin and mineral supplementation, immunisation, de-worming, promotion of appropriate child feeding and hygiene practices, and nutrition education.

More like this

Resource: Independent Evaluation of the CMAM Model Surge Pilot

Executive Summary This report is the result of an Independent Evaluation of the Pilot CMAM Surge Model project conducted in two subcounties of Marsabit between May 2012 and...

NEX: Meeting demand peaks for CMAM in government health services in Kenya

Regine Kopplow et al. Field Exchange 47, p3 The humanitarian community and national governments increasingly recognise that early warning and response are more effective and...

FEX: Implementing the IMAM Surge approach - experiences from Kenya

View this article as a pdf By Weldon Ngetich, Grace Gichohi, Francis Wambua, Tewoldeberhan Daniel, Yacob Yishak and Patrick Codjia Weldon Ngetich is a Nutrition Specialist...

FEX: CMAM Surge: lessons learned on the journey so far

View this article as a pdf By Erin McCloskey, Amanda Yourchuck and Peter Hailey Erin McCloskey is a Public Health Nutritionist and independent consultant currently working...

FEX: Expanding CMAM Surge beyond nutrition – towards a broader Health Surge approach

View this article as a pdf By Erin McCloskey, Kate Golden and Amanda Yourchuck Erin McCloskey is a Public Health Nutritionist and independent consultant currently working for...

FEX: The ‘CMAM Surge’ approach: setting the scene

View this article as a pdf By Amanda Yourchuck and Kate Golden Amanda Yourchuck is an Emergency Nutrition Advisor for the United States Agency for International Development...

en-net: Appel aux Conseillers pour l'adaptation de l'approche CMAM Surge (augmentation de la prise en charge communautaire de la malnutrition aiguë sévère) au contexte Éthiopien.

Background Concern Worldwide developed the CMAM Surge Approach to support health systems to become more resilient to the shocks and stresses that regular surges in the demand...

en-net: Consultancy to carry out CMAM Surge Approach Cost Effectiveness Analysis

Background Concern Worldwide developed the CMAM Surge Approach to support health systems to become more resilient to the shocks and stresses that regular surges in the demand...

en-net: Consultancy for CMAM Surge Approach Learning Review and Evaluation

Background Concern Worldwide developed the CMAM Surge Approach to support health systems to become more resilient to the shocks and stresses that regular surges in the demand...

FEX: Timely expansion of nutrition development activities in repose to an acute flooding emergency in Malawi

By Natasha Lelijveld, Elizabeth Molloy, Jennifer Weiss, Gwyneth Hogley Cotes Natasha Lelijveld has recently completed a nutrition research project in Blantyre, Malawi and is...

FEX: CMAM Surge: the way forward

View this article as a pdf By Kate Golden and Sophie Whitney Kate Golden is Senior Nutrition Adviser at Concern Worldwide. Her career started in Ethiopia in 2003 in one of...

FEX: Scale up of high-impact nutrition interventions in the informal settlements of Nairobi, Kenya

View this article as a pdf Lisez cet article en français ici By Kassim Lupao and Esther Mogusu Kassim Lupao is a senior manager for the Nairobi urban health and...

FEX: CMAM Surge: understanding costs and potential contribution to CMAM’s cost-effectiveness

View this article as a pdf By Kate Golden and Simone van Dijk Kate Golden is Senior Nutrition Adviser at Concern Worldwide. Her career started in Ethiopia in 2003 in one of...

FEX: Post script: Building resilience: nutrition and beyond

By Gabrielle Appleford and Wendy Erasmus Gabrielle Appleford is a freelance consultant working with Concern Worldwide Kenya on knowledge management. Wendy Erasmus is...

FEX: Suggested New Design Framework for CMAM Programming

By Peter Hailey and Daniel Tewoldeberha Peter Hailey was a Regional Nutrition Specialist in the UNICEF East and Southern Africa Regional Office and is now Senior Nutrition...

FEX: Editorial

View this article as a pdf Dear Field Exchange readers, Welcome to the 64th edition of Field Exchange. We are delighted to kick start 2021 featuring a special section on...

FEX: Adaptations to community-based acute malnutrition treatment during the COVID-19 pandemic

View this article as a pdf Lisez cet article en français ici By Maria Wrabel, Sarah King and Heather Stobaugh Maria Wrabel is CMAM Adaptations Project Officer with...

en-net: Intergrating CMAM in routine health services

With evolving development and experience in management of acute malnutrition, more focus is now on intergrating CMAM/IMAM into routine health services. Assesing the capacity of...

en-net: Design framework for CMAM programming

This question is edited from a discussion initiated by Victoria Sibson directly with the authors of the recent Field Exchange article "Suggested New Design Framework for CMAM...

FEX: The roll out of IMAM in Kenya’s urban slums

By Koki Kyalo, Claire Orengo, Regine Kopplow Koki Kyalo is the Urban Nutrition Programme Manager at Concern Worldwide, Kenya. She has worked with Concern Worldwide for five...


Reference this page

Regine Kopplow, Yacob Yishak, Gabrielle Appleford and Wendy Erasmus (). Meeting demand peaks for CMAM in government health services in Kenya. Field Exchange 47, April 2014. p3.



Download to a citation manager

The below files can be imported into your preferred reference management tool, most tools will allow you to manually import the RIS file. Endnote may required a specific filter file to be used.