 When somebody is eligible to get a vaccine, he or she typically needs to schedule an appointment online. In many countries across the globe, we're seeing that this is a challenging task. It can often take hours, across multiple days, to actually succeed in getting a vaccine appointment. It's a terrible end-user experience, so let's take a look at why and how we can improve this. Let's suppose we know our vaccination supply four days in advance. So by Thursday evening, 9 o'clock, we know how many people we can invite for a shot on Monday, and by Friday evening, 9 o'clock, we know how many we can invite on Tuesday. So one way to fill up these slots is to have people pick their own appointments on which date and which time suits best for them. And you might think this is a user-friendly approach, but let's take a look at what actually happens. When people want to actually make an appointment, they come to the website, and the website of course says that no slots are available currently if they come on Monday or Tuesday or Wednesday, and they need to come back on Thursday evening. And of course they all come back on Thursday evening. Now at that point, there are about 20 people for every vaccination slot, so everybody needs to hit the refresh button a number of times on their browser until at least 5% of them get an appointment. And then all the others, 95% of them, don't. They walk away empty-handed. And those 95% can come back the next day, and can do another virtual fight to get in the few spots that are available right now. What's the other approach? In the other approach, we do, when we come to the website, we'll say, okay, we register you, we ask for your availability on the next few weeks, and based upon that, as soon as vaccination slots open, we actually calculate the, we do calculation, and we assign the people from that pool to those slots, based upon their availability, based upon their distance to the vaccination center, so everybody can go to their nearest vaccination center. And of course, we prioritize people based on their priority group, and of course their age. If you want more, learn more about this second approach. Take a look at my previous video and the optoplaner.org website.