A group researched the top 9 charities to give to on the holidays. It’s a surprising list.

Deworming and tropical disease prevention in the developing world might not be the obvious option for where to spend your spare holiday cash.

But it might be where your dollar will do the most good.

A teacher devotes a student a deworming tablet in Hyderabad, India. Photo by Noah Seelam/ Getty Images.

That’s according to a listing of the nine “Top Charities for Dedicating Season” released Monday by GiveWell, a nonprofit organization that applies a data-centered approach to deciding which aid organizations do the most good for the most people. The result is a surprising list of charities with a range of causes that might be unfamiliar to many who want to give, but whose impact is often more immediate.

“We want people to be able to leverage all the time we’ve spend groups together this list so they can make a gift with confidence, ” explains Catherine Hollander, a research analyst with GiveWell.

For the annual chart, the group assesses charities in four categories: 1) transparency, 2) cost-effectiveness, 3) need, and 4) overall effectiveness, before awarding or denying it a spot. To measure cost-effectiveness different groups calculates impact on a scale of “lives saved or improved per dollar spent.”

Some of the causes is a possibility obliterate( at the least, in the developed countries ), but they’re wonderful options for those on a tight holiday budget looking to help the most people possible .

This year’s top selections are:

1. Against Malaria Foundation

An organization that buys and distributes mosquito nets to families in malaria-afflicted countries.

2. Schistosomiasis Control Initiative

A U.K.-based charity that provides Ministries of Health in East, Central, and Western africa with drugs to treat parasitic infections.

3. Malaria Consortium’s seasonal malaria chemoprevention program

A nonprofit that specializes in the prevention and control of malaria, distributing life-saving medications to young children affected by the disease in Africa and Asia.

4. Evidence Action’s Deworm the World Initiative

An organization that supports school-based deworming programs in Africa and South Asia.

5. Helen Keller International’s vitamin A supplementation program

An initiative that funds and provides training to government-run supplement drives in sub-Saharan Africa with the goal of reducing malnutrition and averting blindness and poor vision.

6. Sightsavers’ deworming program

An anti-blindness and disability rights organization that operates a deworming initiative in Africa.

7. END Fund’s deworming program

An anti-neglected tropical cancer nonprofit that operates a deworming initiative with a particular emphasis on Africa.

8. Evidence Action’s No Lean Season program

A program that offer no-interest loans to Bangladeshi farmers during annual periods when income is low.

9. GiveDirectly

A nonprofit that allows donors to send fund immediately to people living in extreme poverty via a mobile app.

A key component of the list is making sure the programs GiveWell recommends are more effective than merely sending cash to people in need( or as effective, as is the case with GiveDirectly ).

That entails not only stimulating sure they’re cost-effective, but ensuring the intended beneficiaries of the food, medication, money, and preventative netting actually receive and use them. For the deworming charities, that involves, “going door to door and interviewing children to see if they received de-worming therapy, ” explains Isabel Arjmand, also an analyst with the organization. Occasionally, GiveWell representatives conduct the on-the-ground reviews themselves. Other times, researchers with the organization analyze data provided by the charities, which is reviewed for reliability.

Children in Cambodia sleep under a mosquito net. Photo by Paula Bronstein/ Getty Images.

The list isn’t fully comprehensive, as GiveWell focuses on programs where the data on impact is plentiful and readily available. Initiatives where results are harder to quantify — those that promote women’s rights, LGBTQ equality, racial justice, etc. — aren’t an area of focus. Nor are causes like cancer prevention that disproportionately affects people in the developed countries, where the cost-per-life-improved ratio is far higher. But for anyone who wants to ensure their dollars go to help the world’s neediest people quickly and efficiently, the listing is an invaluable tool.

“One thing that for me personally genuinely connects when I think about giving to causes that I haven’t myself experienced is … ‘What am I really trying to accomplish, ‘” Hollander says. “For me, it might be to alleviate suffering in general. And then I’m really excited to give to the place that allows me to do that to the fullest magnitude that I can with my donation.”

Contributions can also be made directly to GiveWell, which distributes the funds among the recommended organizations according to need .

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