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Sanibel has supplied the forum for presenting, discussing, educating, criticising, and inspiring the development of the electronic structure and dynamics of atoms, molecules, and solids since 1961. Later, major developments presented at Sanibel included the density matrix renormalisation group approach (DMRG) and the introduction of explicit R12 and F12 interaction terms to correct for the failure of basis sets to better describe the critical correlation cusp in WFT calculations. These were the first hints that non-variational, "linked" diagram methods that guaranteed size-extensivity would eventually largely displace variational methods like CI in treating the correlation problem in WFT. [Extracted from the article] Copyright of Molecular Physics is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)