7 Ways to Influence People with Robert Cialdini, Ph.D

In this Bulletproof Radio episode, host Dave Asprey interviews social‑psychology pioneer Robert Cialdini about the science and ethics of influence. Cialdini reviews the classic six principles from his seminal book—reciprocity, commitment & consistency, social proof, liking, authority, and scarcity—illustrating each with concrete anecdotes (airport seat‑swap, job‑interview technique, menu asterisks, testimonial placement, limited‑time offers). He contrasts ethical influence with manipulation, emphasizing that influence must rely on genuine, observable principles rather than fabricated claims. The conversation also touches on the role of NLP‑style language, the distinction between being an authority and being in authority, and political applications of reciprocity. Cialdini reveals a newly added seventh principle: tribalism or shared social identity, explaining how signaling group membership dramatically boosts compliance. He relates this to the biohacking community and remote‑cohesion strategies, offering practical advice on wording and co‑creation. Throughout, he stresses evidence‑based, peer‑reviewed research as the foundation for applying influence responsibly.
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You're listening to Bulletproof Radio with Dave Asprey today. It is a great honor to bring a guest back on the show who was on about 450 episodes ago, Guy who pioneered the science and psychology of influence. In fact, he's known as the godfather of influence. His name is Robert Cialdini. He's the guy who studied influence and how to use it ethically in business. Over 40 years of using evidence based, peer reviewed scientific studies. He's written an epic, epic book called can you believe it Influence? And just re released it with a bunch of new information in it. Robert, it is a great honor to have you back on the show today.
Well, I am looking forward to it. I have to say. We had a good experience last time. I'm looking to replicate it this time.
We also this time have the Upgrade Collective members in our live studio audience. If you're just tuning into the podcast, the Upgrade Collective is my private mentorship and membership group. And part of the benefits, there are many that come for members, is that you get to tune in while the podcasts are being recorded. I'm actually looking at the members, they're looking at me right now and they'll be asking some questions at the end of the show. So this is a new format that's been really popular. So know you have not just me, but lots of people there.
Great.
You've been relatively recently elected to the American Academy of Arts and Sciences and the National Academy of Sciences. Did you think when you started on this path of studying influence decades ago that it would get to this point?
Never. First of all, the National Academy of Sciences, for example, only has 12 social psychologists in it. And back when I started, there were none as far as I could tell. So it just didn't seem that Influence, science, persuasion, science was something that would have a category that would allow me into that body of people. You know, they told me, oh, during the meeting where you're inducted, be sure to come to that meeting. You get to walk across the stage that Albert Einstein walked across. Well, there's no similarities. We're not comparable in any way. But that kind of thing just never occurred to me as in my future.
Well, it's a huge honor and I think you've earned it with your work, which is really cool because everyone says they want to be influential, but do they even know what they're asking for? If you're Talking to a 20 year old and I want to be influential, why do they want that?
Why do they Want it. It seems to me that there are a lot of ways you can be influential. You can influence a person's attitudes, you can influence their beliefs, you can influence their perceptions of you. You can influence their definition of the situation in which they're. But it seems all of those occur in the service of influencing their behavior. So that's what I mean by the influence process. I mean being able to move people to say yes to us more frequently, to comply with our requests, recommendations, proposals, and so on. And here's the secret, it seems to me, without changing the features of what we are offering them, but only changing the way we present those features to them, the psychology of that, very frequently we don't get to change the features of some offer that we have. We get to change the way we deliver that message about the merits of this case. And that just always struck me as worthy of studying because, truth be told, all my life I've been a sucker. I've always been kind of a pushover for the appeals of various fundraisers or salespeople who would approach me. And a lot of times I would find myself in unwanted possession of things, and I would say, wait a minute, it couldn't be the merits of the thing. It had to be the psychology of the way those merits were offered to me that swept me. That's worth studying.
One of the reasons that I appreciate your work so much is that when you understand how influence is applied, you can see when it's used against you consciously or unconsciously, and it sort of opens your eyes up, right? So I look at some of the media campaigns running today, like, this isn't even elegant influence, the way they're doing. Like, come on, guys, at least do a better job of trying to trick me. Come on, you can do better. Do you find that you get tired or frustrated or maybe a little bit bitter when you see people misusing influence?
You know, frustrated is closer to it because it seems to me the opportunities for genuinely influencing people to their betterment so they get a chance to seize an opportunity that really would enhance their outcomes. If we fumble that away, we do both of us a disservice. So that is really something. I, I, I always shiver when I see somebody dropping the ball that way.
I, I don't pick up any bitterness in you. You're actually a really vibrant, happy guy. You can tell you've got, you know, you like what you do, so I would have been surprised if it brought you there. But, yeah, frustration when you see someone, you know, don't use that Technique to get people to, you know, drink sugar water or something. It's not nice.
You know, I do try to nudge people in the right direction. There is an example that I talk about in being in an airport and hearing the guy behind the counter say that the. The plane was full and he was offering a bonus to those people who would give up their seat for, you know. And he said, and if you will do that, we will give you a two dollar credit. And everybody laughed. And then he said, no, no, really, it's $200. That was exactly what he should do because he put into action the contrast principle compared to $2. Now, $200 seems more than if he had just said $200 by itself. That was. So I went up and I congratulated him on that.
Now, do you think he was trained to do that or was he just naturally good?
Yeah, he was just naturally good. I asked him about that. Is that in your tr. No, no, he said, no, I think it was trial and error on his part. You know, just how do we get people? And he said, you know, first of all, you got to get them to pay attention to you. So if you say $2, they look up and say, what? And then they're. They're ready to hear the next thing you say. So it was really brilliant.
Those are the kind of people, when I see them in the wild, I'll sometimes hire them because they're true geniuses, just, you know, not necessarily knowing what they're doing. You came up with in your original book, which is sold like 5 million copies or something, a lot. You came up with six principles of influence. But in your new version that's very heavily updated, you added a seventh. Can you walk me through the six and walk our listeners through? So when someone. You're listening to this saying, all right, what would I have to do to be influential or to know if influence is being used against me? What are they?
So the first one is what is called reciprocity, reciprocation, the rule that exists in all human cultures, by the way, that we are obligated to give back to others what they first give to us. So there's a very simple implication of that. If you want others to give you attention, if you want them to pay to benefit you, benefit them first. Pay attention to them first. I always advise, if you go into a room where you want to be more influential, your first question should not be, who can help me here? Your first question should be, whom can I help here? Whose circumstances can I enhance? They will then be standing on the balls of their feet ready to give to you what you need when you need it. That's the way to operate with that. So that you're always arranging for relationships where people want to say yes to you. And it's very important not to slap that influence opportunity away. How many times this used to happen to me all the time. I would do somebody a favor, go beyond the call and they would thank me profusely for it. And I would say, ah, don't think anything of it, no big deal, just part of the job. Just I would have done it for anybody. I mean, literally slapping that earned influence out of the window. And, and so now what I advise is if that ever is the case, if somebody says thank you in a genuine way to you for what you've gone out of your way to accomplish for them, if you're part of an organization or you have a history with them or a friendship with them, here's what you should say. Of course it's what long term friends or long term partners do for one another. You put it on the map. You don't diminish it, you don't minimize it. Now if you don't have a history with them, it's the first time you've interacted with them. You say something a little differently. I think you say, of course I was glad to do it. I know if the situation were ever reversed, you do the same for me. And it's very important not to say if the situation had been reversed, you would have done the same for me. That's locating it in the past with some exchange that will never exist. No, if the situation were to be reversed, I know you'd do the same for me. Once again, you've put it on the map and people are already. Yes. You know, this is the thing that I've done with the new edition of the book. There were these six principles and people would say to me, you know, we get a lot from those principles, but can you tell us exactly the best way to trigger them? What's the best wording or the best action I can take to harness the power of that principle? And so a lot more of that is in the new book where I talk about exactly what words to use to send the power of that influence into the situation for you?
Did you study neuro linguistic programming or NLP like Tony Robbins talks about it and all of that? Is that a part of your sources for this?
I did and I always felt that there was so much good information there. So the logic that they employed fit with existing psychological theory. I haven't been a practitioner of it because I'm a researcher and the NLP people, they count on the logic rather than the empirical evidence for what they're recommending. And I'm just, I prefer to be over there on the, on the research based, evidence based side.
You can find evidence that if you use the right language that may come from that world of nlp, it works better. And there you go. Okay, that's right, I've got it. Yeah, I, I've studied, I've read the original Bandler books and all that stuff. But I don't think it's necessary to practice NLP to get people to do things. As long as what you're asking them to do is the right thing and you, you know, couch it properly, you shouldn't have to manipulate them.
Right.
You can influence them without manipulating them.
Oh, that's, that's such a crucial distinction. I hope we get to it later.
Yeah, I want to ask you about that right now. So the difference between manipulating someone and influencing them, how do you know when you're doing one versus the other?
Because you can tell is this is the principle of influence that we're going to talk about. You know, like reciprocity, liking, authority, social proof, scarcity. Are they really there in the situation waiting for you to point to them, point them out to the person who you're trying to convince. If so, you have influenced in an entirely ethical and I'm going to claim commendable way you've educated them into ascent. If that principle is fabricated there, if it's counterfeited, if people are lying with statistics to tell you about the, the growth of their product or the popularity or they're, they're not giving you an accurate picture of what the authorities are really, the experts are really saying about their idea or product. That's the manipulation, that's the exploitation of these principles and of the audience to them. And as a consequence you lose long term advocates who are cheated. They ghost you at that point.
So for all you Internet marketers listening to this right now, rewind and hear that part again. It's not okay to lie to people to get them to do what you want to do. What about politicians? What about politicians? What's different for those guys? Because it seems like they aren't very reciprocal, at least I haven't seen much of that in my short life.
Actually they are. If these days though they're, they see themselves as adversaries rather than cooperators. Working for the best interests of their constituency or of the country at large. It seems to me that they're, they're, they're sharpshooters, they're, they're picking each other off rather than finding a way to, to interact in ways that are, that are mutually beneficial. But there's this. The great story of Lyndon Johnson, who for years he was the speaker of the House and then the head of the Democratic Party in the Senate and a majority leader. And in those positions, he was able to give all kinds of favors to politicians on both sides of the aisle. And when he came into power, he was able to produce a set of legislation that was unheard of by getting people from both parties to, to sign on to it. Right. And if you look at the biography of him, it turns out the way he did it was calling in his favors, getting the reciprocation process to work, and that's how he got these, the Great Society programs enacted. These days you've got people like, like Clinton, like Obama, like Trump, who say, I come to Washington from outside the Washington establishment. Nobody. I am not obligated to anybody there. And it accounts for why they were having so much trouble getting their program because nobody there was obligated to them.
It makes sense. That's why you might want to elect a career politician, because at least they know how to play the game and they have some sort chits to cash in.
Right.
Versus a disruptor. I, I see your point there because it's, it seems like not a lot's been getting done lately, but hey, what, what do I know? I live in Canada now. Not that politics are any different. So that definitely covered reciprocity, which is only one of the big six. And, and I really want to get to the seventh new addition to your work, but. So you have commitment and consistency that's doing it regularly, right?
Yes. So. But what you want to count on is that the people that you want to move in your direction feel a need to be consistent with what they've already said or done in your presence. So if you can get them to take a small step in your direction, they'll be significantly more likely to want to take another step in that direction. I have an acquaintance who says he uses this in job interviews. He said he was having a hard time getting hired, and then he did one small thing differently in job interviews where he would go in, there would be an evaluator or maybe a team of evaluators, and he would always say the same thing to them. So I'm Very glad to be with you and I want to answer all your questions. Right. And it wasn't getting him too far. But then he added one thing. He said, but I'm curious, I have a question for you. Why did you invite me here today? What was it about my resume or my background? And he would hear them make commitments to his strengths. They would say, well, it was because of your credentials or because of your experience, because you give evidence of being a fast learner, whatever it was. And then he knew what their they were looking for. And he would hear them because they had made active commitments to those things, continue to be consistent with those commitments. He said, this is an acquaintance of mine. He said he's gotten three better jobs in a row using that strategy.
Wow. This whole episode of Bulletproof Radio, if you're looking for work, that one little hack is gold. No one's asked me that during an interview, but I can see how it would work because then you've already said they're good and then you have to go back to your team later. And so actually I told them they were good, but now I'm going to tell you they're not. And it creates a logical fallacy in your brain. Wow, that's some serious, serious power. Thank you, Robert. What about social proof? I mean, we all have likes on our Instagram pages and whatnot. But how does social proof work in the world of influence?
The way you see it, social proof works by reducing uncertainty. We live in what is the most information overloaded, stimulus saturated environment that's ever existed on our planet. We have all these choices, all these, these opportunities to move in one direction or another, all this information, and it leads us to be uncertain about the best choice to make. One way we can reduce that uncertainty is to ask ourselves, what are the people around me like me doing in this situation? Right. It's something that we call peer suasion instead of persuasion. Peer suasion, which turns out to be more effective than simple persuasion. If you can get people to see that a lot of others are experiencing your product or service or idea in a positive way, well, you've reduced their uncertainty about the likelihood it's going to be positive for them too. So for example, there was a study I love from Beijing, China, shows you the cross cultural reach of social proof. Some restaurant managers put little asterisks next to certain items on the menu and they didn't. The asterisk didn't stand for or refer to the specialties of the house or the chef's special for that evening. No, they just signified this is one of our most popular items. And each one immediately became 13 to 20% more popular for its popularity.
Wow.
Well, we all have most popular models, we all have most popular features, we all have most popular upgrades, we even have most popular payment plans. We're fools of the influence process. If we don't just point to that, it reduces people's uncertainty. They get off the fence now and get into the game of choosing as a result.
That is so fascinating. And I imagine that that restaurant put the asterisk next to the highest margin items on the menu.
It didn't matter where they put them.
Exactly.
Here's another little interesting feature of it. Although every demographic then became more likely to purchase the items they had the asterisk most popular asterisk. There was one group that far outstripped everybody else. First time visitors who were uncertain. And they use the evidence from peer suasion to decide. So if you've got a, if you've got a startup or you have somebody who's come to you who hasn't been a long term customer, Social proof is gold.
Got it. So I can say the Upgrade collective is new people's favorite way to learn more about all of the content that I've created. And just by saying that thousands of people listening are signing up for the program right now.
I wouldn't be surprised. It's a good program.
It definitely is people's favorite way. But that's a truthful statement, not a manipulative one. Now so we've covered reciprocity, hard word to say. And the commitment and consistency. Social proof. And what's the difference between social proof and liking, which is the fourth of your major principles.
So liking is the principle that says nobody would be surprised. Anybody who's a listener would not be surprised that prefer to say yes to those we like. Right. The. The surprise is how simple too small things could be to produce that rapport that we're looking for that serves as the basis for everything else we do. Once people like us, you know, they want to do business with us. And, and one is to point to genuine similarities that exist and between us. The other is to point is to give genuine praise, to give true compliments. That this was my greatest weakness all through my life, failing to give people warranted compliments. I can't tell you the number of times in research meetings with my graduate students I would hear myself say that was really smart what Brad just said. Or you know, how Rosanna, just how she just characterized that is a great insight for how we go next, the next step we take. And I would say it to myself and lose all of the, all of the goodwill that would come from that exchange. That, that and I don't do. I've trained myself now whenever I hear myself complimenting someone in my mind, I move that complement from my mind to my tongue. And Dave, it has been remarkable the consequences of that for the relationship building features of that next step.
So we've got to combine that with BJ Fogg's work on habit formation. So you can form a habit of taking the good things you think about others out of your mind and putting them into your mouth. That's also profoundly good advice. Robert. Thank you. I am going to work on that one myself because yeah, there's all kinds of good stuff that happens, but if you don't say anything, did it really happen?
That's a bullseye. That's absolutely a bullseye. In the same way that you may have the most popular feature that you think really gives the most benefit to people if they upgrade to it. If you don't say so, if you just don't say as if it isn't the most popular.
I really like the idea of saying this is the most popular because there's a thing that happens where you don't always want to be a shill for your own stuff. I talk about bulletproof coffee sometimes, but I didn't bring it to death on the show and things like that just because I'd rather shine praise on all the great work in the world that isn't mine. Because I figure if you're listening to the show, you already know it. How do you cross that line between hey everybody, everybody, look at this really worthy stuff that I did versus thank you for all of your work. Robert.
Right.
How do you suggest people navigate the not over self promoting yet being being useful to others?
You're. You've hit on the next principle of influence besides the one we've just talked about and it is testimonials. So you're not the one waxing rhapsodic about yourself. There are other people. So one kind of person, that is peers who can speak to their experience with the whatever it is, bulletproof coffee, whatever, and experts who can talk about the health benefits and the flavor features that are built into it. Right. And you don't have to be the rooster crowing about yourself. Right. So you so for me, testimonials not only should be used well and often they should be used first on Your website, they go before you even begin to make your case. So all of the aura that comes from that testament, especially if it's an expert, an authority or someone that they feel is a credible source of information that flows to the very first word you write or utter.
Well, I'm taking notes because I could definitely do a better job on that. I mean I have tens of thousands of testimonials for bulletproof diet and all that. And I always felt a bit like a douchebag. Like I'll put those up front and center on the website and all we're like, I don't know. But they're all authentic and they're all real. But I guess maybe I have an internal thing I don't want to over self promote.
Right.
But also I feel like it's worth it for people. So where's that coming from?
Yeah, so I, I, because we, you don't want to be seen as a braggart. You don't want to be seen as a self promoter. It reduces your liking. Right. You know what I used to do? And then finally it hit me on my website we have a category for testimonials. Our visitors had to go there. What a mistake. No, no, Take a few of those and then rotate them around, by the way, to show. Right. These are testimonials right at the outset. The first thing people get when they come upon our website is a testimonial from somebody who they're likely to know and believe because this person has a, a good reputation. So those, those kinds of mistakes are things that I've, I'm glad to dispense because I learned my lesson and. But I had a tuition charge I had to pay that I hope your listeners won't have to pay as a result.
You understand why this show exists is I want to learn from you. And also I want everyone listening to not, not pay the tuition, as you so elegantly put it, for all this stuff. Because God, we've both made enough mistakes in our lives, right? Which does make us authorities, which is one of the other, the other principles in your book influence or say your new book on influence. So talk to me about authority. Does it only come from others or does it come from being an authority yourself?
Yes, it's. And you said it the right way. It's being an authority, not being in authority. And you said it the right way. It's being an authority, not being in authority. In authority is a boss. In authority is somebody who commands or can control my behavior because they can apply rewards or punishments and control me that way. That's power. It's not influence in the way that I'm using it. No influence. And by the way, people don't like being pushed around.
They don't like being commanded.
And so they. When you're not there, they sneak around the corners. Right. And don't comply. But if you're an authority and have convinced them that this is the right step to take, now they carry that around them with them wherever they go. That belief that you've instilled as to this is the right way to proceed, so you will do well is there with them, and they can abide by the recommendations from that idea or fact.
I like that difference between being in authority versus an authority. It's such a big deal. It makes me have to ask, though. 48 laws of power. Robert Greene, are you a fan?
Yes. I mean, there's a lot in there. But you know what? No, I. This. I'm not dissing this at all. You can't remember 48.
That is true.
You can remember seven. We've got seven principles. That's manageable. 48.
Yep.
I can't remember.
Yeah, you have to pick the right one. You're right. 48 is a lot. And Robert's been on the show a couple times. But it's funny because you're talking about influence versus power. Yeah, right. And they are different. They're fundamentally different. And influence is a softer form of power, but it's one that's way more palatable. Right, right. And in my world, I want to know when people are using influence against me in a. In a negative way. And I want to know when they're applying the tools of power against me in the right way so that you can respond appropriately in either one. But influence is sneakier than power. But I think it's more powerful at the end of the day.
Yeah. Often it happens. It flies below the surface. You don't even recognize that you've been moved by a word or two that's been applied productively.
What about scarcity? And that's your sixth principle from your. Your original book. How does scarcity come into play when you're influencing people?
People want more of those things they can have less of. So it means that if you can, first of all, the thing that we all learned in our training, make your differentiator prominent in consciousness, the thing that's unique to you and what you offer, often it's not one thing, but it's a suite of things, a combination of things. None of Your rivals can provide that, set up that set of, of differentiating elements and make that central or very prominent in your appeal. Because people see if they can't get it anywhere else, they get a little crazy to want it more. There was a. And. And this really works online where there was a study done. 6700 commercial online sites were tested by these researchers in terms of what they had used in their AB tests to see which features of the site made the most difference in moving people into conversion from prospect to. To customer. And they, they located 29 different features. Some of them were just technological, like is there a search function within the thing? Some of them were financial. Is there, is there free shipping? Some of them were designed to be persuasive. Is there a call to action? Right. None of those made any difference. The top six were the six principles of influence.
Wow.
And the top of those, a particular type of scarcity. Limited number scarcity. If there is a limited number of options at this price or a limited time when you could get this at this price and there are competitors for those things that out distance all 29. The next was social proof. But the top. If you're in competition for something that has limited number, it means you better get it. Otherwise those rivals could make you lose it. And we hate to lose. Daniel Kahneman's prospect theory won him the Nobel Prize in economics, showed that people are more motivated to get something if they are considering how it might be lost to them than how it might be obtained by them. We're more psychologically mobilized into action by the thought of losing something than gaining that same thing. Right.
So, yeah, that seemed to work well for the vaccine marketing campaign where there's a limited number of doses. Get yours while you can. And it created a big surge of demand that then petered out when people realized it wasn't actually that limited.
Exactly right. Exactly right. That's what we're facing.
Exactly. Okay, then what about the new principle? And so it's a big thing where you have a book with 5 million copies or so that are out there that's been very well received, won all the awards, and you're saying, all right, I'm going to go through. And based on a lot of new learning, I'm going to add things, but I'm going to add a new principle that's kind of the highest level. What is the new principle that's in influence? The. The new version of influence. Yeah. What is it and why did you decide to add that one?
Okay, so that this is a Good question as to why I decided to write this book. You know, as you say it, it's been very successful. And there's this saying, don't fix what's not broken, right? But I remember a quote that my grandfather used to always use, like when things were going well, he would say, if you want things to stay the same, things are going to have to change around here. I mean there's so much wisdom there, you can't sit on your laurels. Right? And so I knew I had to update and the, there was this evidence that was all around us right now. Tribalism, right? The extent to which we are driven by the groups, our membership and loyalty to the groups that we are in. Right. And, and if a communicator can arrange for me to see him or her as a member of a group that I identify myself with, right. I define myself in that group, right. All my barriers to influence by that communicator drop. I just say yes to the people who are not just like me in kind of like liking principle or similarity where, oh, we share the same preference in ethnic food or music or comedies or movies or no, no, we share a membership in the same important social identity based group. Here's an example of what I mean. Study was done on a college campus. Young woman was asked to stand a college age young woman, researchers had her stand in a busy spot on campus and ask passersby, other students for donations to a good cause. And she was getting some contributions. But if she was asked to add one sentence to her request, contributions more than doubled. And the sentence was, I'm a student here too. I'm one of you. And now 250% more compliance, right?
Wow. It, it's interesting. The reason I didn't trademark the term biohacking back when I was creating this movement is I wanted there to be a group of people who were working on upgrading ourselves. And I didn't want to have that authority power that we talked about before where you're like, I own this, but it's its own group. But people who are biohackers, like, oh yeah, I'll do this to help other biohackers or I'll do this because our knowledge is expanding. And I don't know how conscious I was of the principle you're talking about here, but it so applies to why biohacking is a global phenomenon with millions of people who are doing it now.
We're so generous, we favor the people inside our groups and we follow their lead too. I mean, something happened to me a while ago I saw this newspaper article that rated celebrities and their allegiance to various NFL football teams. Right. Well, I grew up in Wisconsin and so the Green Bay packers were always my home team. And I saw that in this article. Justin Timberlake and Lil Wayne are both avid packers fans the way I am. I immediately came to think more of their music, better of their music. And I wish them greater success. They were of me and I wanted them to succeed. That's the, I mean, that's the lever for change. And people who understand how to use it to create this sense of we ness or partnership with another are greatly advantaged.
I really, I really like that. And it, it's changed a little bit in the era of. The era of COVID where people are way more remote than they were before.
Right.
But it seems like it's working that the biohacking conference that I've put on for almost 10 years now obviously has gone virtual for a little while and we're going to have a physical one later this year. But now we've got more than 10,000 people who will be at the conference. Much bigger than it was before. Yeah, but the, the tools and technologies to be able to create the sense of unity even though we're remote. It's face to face, video and all that. Do you have any recommendations for people who are working on creating unity even if we're not going out to dinner together right now?
Yep. And I'm going to give an example that involves changing one word in what you say when you appeal to another individual to come on board with you to be a supporter of what it is that you are offering. Let's say, let's take co creation as an example. I'm a big fan of asking our customers, our prospects to our clients to co create the next version of our product line or a particular direction for us to take and so on. So they, they give us feedback on what they think is most valuable.










