There are plenty of opinions out there about what you should do to ensure a happy, long-lasting relationship. Your mom says that it鈥檚 all about communication; your best friend swears by keeping things romantic 鈥 and don鈥檛 even get us started on the lessons we all think we can learn from our favorite rom-coms. With so much conflicting advice out there, it鈥檚 hard to keep track of what we鈥檙e really supposed to be doing to keep our relationships going strong. Luckily for us, a study spanning four decades weighed in, and the results reinforce what we all want to hear: Successful couples are kind and generous to one another.

Couple sitting at city cafe drinking espresso

According to a recap from The Atlantic of these studies, the fascination with observing married couples began in the 1970s, when social scientists took notice of escalating divorce rates and grew concerned with the way the trend would affect children. In 1986, psychologists John and Julie Gottman set up The Love Lab at University of Washington and invited newlyweds to join them to discuss their relationships.

The Gottmans wanted to do more than have a casual chat with these couples about their recent weddings or their experiences living together. Study participants were hooked up to electrodes for these conversations, during which they were asked questions about their relationship while sitting next to their spouses. Scientists used output from the electrodes to observe blood flow, heart rate and sweat production during the study. Six years later, John and Julie Gottman followed up with the couples to find out if they had broken up or stayed together.

Pairs who had made it to the six-year mark were coded as 鈥渕asters鈥 by the scientists, while those who鈥檇 called it quits or who were chronically unhappy were identified as 鈥渄isasters.鈥 At this six-year check-in, the Gottmans used the data they鈥檇 collected with the electrodes to discover that the successful couples had all been calmer during their original interviews than the unhappy couples. The 鈥渄isaster鈥 participants more often exhibited quick heart rates and active sweat glands. These partners did not have trust and intimacy, and it showed in their physiology.

Portrait of happy couple

Even more interesting were the results of another follow-up study organized by the Gottmans in 1990. This time, newlywed participants were invited to a lab set up to look like a bed and breakfast, where the scientists simply observed their behaviors while they acted as they would if they were on vacation. John鈥檚 goal was to figure out what specific behaviors (outside of biology) could help predict whether a couple was bound to be masterful or disastrous in the long run. Based on the initial experiment and another six-year follow-up, Dr. Gottman determined that the two key traits of successful relationships are kindness and generosity.

This may seem like a no-brainer, but in the context of these experiments and the ongoing studies they inspired, kindness and generosity are about more than just 鈥渂eing nice.鈥 Successful couples in this study were giving of their time and attention, with one partner frequently 鈥渢urning toward鈥 the other emotionally instead of brushing them off. Newlyweds who were still together six years in were observed meeting their partner鈥檚 emotional needs nine out of 10 times, while unsuccessful copies met those needs just three out of 10 times.

鈥淭here鈥檚 a habit of mind that the masters have which is this: They are scanning social environments for things they can appreciate and say thank you for,鈥 John Gottman said. 鈥淭hey are building this culture of respect and appreciation very purposefully. Disasters are scanning the social environment for partners鈥 mistakes.鈥

In the years since these studies, the Gottmans have found that they can predict the success of any couple with up to 94 percent certainty based on these findings. Do you and your bae want to be part of this success rate? Read on for more specific tips on kindness and generosity based on the Love Lab experiments.

Couple walking with bicycle in park

1. Show interest. If your S.O. points something out to you or tries to engage you in a conversation about something they care about, tune in 鈥 even if it鈥檚 not really your thing. This is an example of 鈥渢urning toward鈥 an attempt at connection.

2. Having a bad dayis not an excuse to disengage. The true test of your kindness and generosity comes when you鈥檙e not feeling at the top of your game. 鈥淚f your partner expresses a need and you are tired, stressed or distracted, then the generous spirit comes in when a partner makes a bid [for your attention] and you still turn toward your partner,鈥 Julie Gottman said.

3. Fight kindly. Master couples do argue, but they know how to express their anger constructively. Instead of making accusations in the heat of the moment, explain why you are hurt and upset.

4. Trust your S.O.鈥檚 intentions. If your partner says they are doing something to make you happy, believe them. Don鈥檛 overanalyze or try to sleuth out ulterior motives. Generosity is all about being giving with your love and appreciation.

5. Share joy genuinely. Instead of waiting for a challenging time to prove you can be supportive, learn to be a cheerleader for your significant other in happy seasons, as well. When bae comes to you with good news, put down your phone and be part of their joy without any distractions.

How are you kind and generous in your relationship? Tweet us @BritandCo!

(Photos via Getty)