The federal government has charged four sham cancer charities with bilking donors out of $187 million in donations.

According to a Federal Trade Commission complaint filed Monday, the charities — Cancer Fund of America, Cancer Support Services, Children's Cancer Fund of America, and the Breast Cancer Society — used donations to purchase everything from luxury cruise trips to jet ski outings to online dating memberships.

Giving to charity is great, not just for the recipients but for the givers too. But stories like this can make it intimidating to know how to pick the best charity, especially when there are thousands of worthy causes to choose from. Here are a few simple tips that can help.

1) Check in with charity recommenders

It's of course possible to research charity options yourself, but it's probably better to outsource that labor to a careful, methodologically rigorous charity recommender like GiveWell. They currently list four top charities:

Against Malaria Foundation, which buys and distributes insecticidal bednets. GiveDirectly, which directly distributes donations to poor people in Kenya and Uganda, to spend as they see fit. Schistosomiasis Control Initiative and Deworm the World, which both work with governments to combat parasitic worm infections. SCI works in a number of countries in sub-Saharan Africa, while Deworm the World is mainly active in Kenya and India, with a nascent operation in Vietnam and plans to expand more broadly.

GiveWell recommends giving 67 percent of your donations to Against Malaria, 13 percent to GiveDirectly, 13 percent to SCI, and 7 percent to Deworm the World.

These aren't just highly effective charities, they're ones that GiveWell has determined have room for additional funding, and will be able to use it. Last year, it de-recommended Against Malaria on the grounds that it had not spent enough of the money it already raised. This year, GiveWell judged that Against Malaria once again has room for more funding, and it made it on the recommendation list again. So you can expect Against Malaria, and the other three recommended charities, to spend anything you give them effectively and reasonably promptly.

2) Pick charities with research-based strategies

GiveWell's recommendations rely heavily on both evaluations done by charitable organizations and on existing research literature on the kind of intervention they're trying to conduct.

For example, its recommendations of SCI and Deworm the World are based on a growing body of research suggesting that providing children with deworming treatments improves educational, economic, and other outcomes. A randomized evaluation of GiveDirectly released last year found that recipients ate more and experienced less hunger, invested in expensive but worthwhile assets like iron roofs and farm animals, and reported higher psychological well-being. Research from the Poverty Action Lab at MIT suggests that giving insecticidal bed nets away for free — as the Against Malaria Foundation does — is vastly more effective than charging even small amounts for them.

3) Give abroad

It's really hard to adequately express how much richer developed nations like the US are than developing ones like Kenya, Uganda, and other countries targeted by GiveWell's most effective charities. We still have extreme poverty, in the living-on-$2-a-day sense, but it's pretty rare and hard to target effectively. The poorest Americans also have access to health care and education systems that are far superior to those of developing countries. Giving to charities domestically is admirable, of course, but if you want to get the most bang for your buck in terms of saving lives, reducing illness, or improving overall well-being, you're going to want to give abroad.

GiveWell actually looked into a number of US charities, like the Nurse-Family Partnership program for infants, the KIPP chain of charter schools, and the HOPE job-training program. It found that all were highly effective, but far more cost intensive than the best foreign charities. KIPP and the Nurse-Family Partnership cost over $10,000 per child served, while deworming programs like SCI's and Deworm the World's generally cost about $0.50 per child treated. If you want to give, give abroad.

4) Consider meta-charities

Another option is giving to groups like GiveWell, Innovations for Poverty Action, Giving What We Can, and 80,000 Hours that evaluate development approaches/charities and encourage effective giving. Suppose that every dollar given to Giving What We Can — which encourages people to pledge to donate at least 10 percent of their income until retirement — results in $1.20 in donations to the Against Malaria Foundation. If that's the case, then you should give to Giving What We Can until the marginal effect on donations to AMF hits $1 or lower.

"If they can turn a dollar of donations into substantially more than a dollar of increased donations to effective charities, isn't that the best use of my money?" asks Jeff Kaufman, a software developer who with his wife Julia Wise gives about half his income to effective charities and meta-charities.

5) Saving lives isn't everything

If you only care about reducing early mortality and giving people more years of life to live, then you should give all your donations to the Against Malaria Foundation. Malaria's a frequently fatal disease, and cost-effective interventions to reduce malaria infection are a great way to save lives.

But the rest of the charities GiveWell recommends don't mainly focus on reducing mortality. Quality of life matters too. Parasitic infections hamper children's development and education, which can have negative consequences lasting decades. Having increased access to cash may not extend the life of a GiveDirectly recipient, but it does make life considerably more pleasant.

6) Don't give to a big charity

You'll notice that all of the charities GiveWell recommends are reasonably small, and some big names are absent. That's not an accident. In general, charity effectiveness evaluators are skeptical of large relief organizations, for a number of reasons.

Large organizations tend to be less transparent about where their money goes and also likelier to direct money to disaster relief efforts, which are usually less cost-effective, in general, than public health programs. "Overall, our impression is that your donation to these organizations is very hard to trace, but will likely supplement an agenda of extremely diverse programming, driven largely by governments and other very large funders," writes GiveWell cofounder Holden Karnofsky.

7) Maybe just give money directly to poor people

My charity of choice is GiveDirectly, which is the only non-public health charity to get GiveWell's top rating, and to my knowledge the only charity devoted to unconditional cash transfers. That's partly because there's a large research literature on the benefits of cash transfers, GiveDirectly's preliminary evaluation was very promising, and GiveWell has found that cash rivals the best health programs as far as cost-effectiveness is concerned.

But it's mostly because I don't trust myself to know what the world's poorest people need most. I've been profoundly lucky to never experience the kind of extreme poverty that billions of people worldwide have to endure. I have no idea what I would spend a cash transfer from GiveDirectly on if I were living on less than $2 a day in Uganda. Would I buy a bed net? Maybe! Or maybe I'd buy an iron roof. Or school tuition for loved ones. Or cattle.

But you know who do have a good sense of the needs of poor people in Uganda? Poor people in Uganda. They have a very good idea of what they need. Do they sometimes misjudge their spending priorities? Certainly; so do we all. And bed nets and deworming treatments appear to be under-purchased relative to the actual need for them. But generally, you should only give something other than cash if you are confident you know better the recipients' needs better than they do. I'm not confident of that. So I give cash.

As the World Bank's Jishnu Das once put it, "'does giving cash work well' is a well-defined question only if you are willing to say that 'well' is something that WE, the donors, want to define for families whom we have never met and whose living circumstances we have probably never spent a day, let alone a lifetime, in." If you're not willing to say that, then you should strongly consider giving cash.