Problem Based Learning (PBL) has been shown to be effective from elementary school through medical school. This would be an excellent domain name for a site devoted to problem based learning, either as a sharing and reference site, or for a book, workshop, learning centre, etc. Problem based learning works, and so can this domain name! The domain name is registered until May 9, 2019, and renews at the very reasonable standard .space TLD rates. The term PBL has excellent SEO stats and CPC value, and Estibot valuate the PBL.space domain name at $870 and the GoDaddy GoValue estimate of worth is $630. The name PBL is already taken in many extensions, and has sold for good value such as $17,500 in .org and $1500 in the .de country code extension. While the .space extension is used by many businesses and organizations, including the Asgardia space nation, there have only yet been a modest number of domain name market sales in the extension. A few of the more significant ones are air.space $17,500, inner.space $15,000, cluster.space $1000 and MilkyWay.space $700.