The nature of the internal assessment (IA) varies by subject. There may be oral presentations (used in languages), practical work (in experimental sciences and performing arts), or written work. Internal assessment accounts for 20 to 50 percent of the mark awarded for each subject and is marked by a teacher in the school. A sample of at least five per subject at each level from a school will also be graded by a moderator appointed by the IB, in a process called external moderation of internal assessment. Based on this moderation, the grades of the whole subject from that school will change.<ref name=assessment/>
Points are awarded from 1 to 7,<ref>{{Cite web |date=December 2017 |title=Diploma Programme Grade Descriptors |url=https://www.ibo.org/contentassets/0b0b7a097ca2498ea50a9e41d9e1d1cf/dp-grade-descriptors-en.pdf }}</ref> with 7 being equal to A*, 6 equal to A, and so on<ref>{{citationCite needed|date=Februaryweb 2023|reasontitle=HowInternational doBaccalaureate they(IB) correspondDiploma to{{!}} A*UCAS toQualification E?Information IProfiles do|url=https://qips.ucas.com/qip/international-baccalaureate-ib-diploma not|access-date=2023-12-29 see any IB documents that say so|website=qips. Also, A* to E describe different grades in various systems, there is no single A* to E grading criteriaucas.com}}</ref>. Up to three additional points are awarded depending on the grades achieved in the extended essay and theory of knowledge, so the maximum possible point total in the IBDP is 45.<ref>{{cite web | title = 45 points = 42 plus 3, but very distinguished 3 points | publisher = [[International Baccalaureate]] | url = http://www.ibo.org/newsletter_recognition/march_2006/articlefour | access-date = 14 August 2009 | archive-url = https://web.archive.org/web/20090904124528/http://www.ibo.org/newsletter_recognition/march_2006/articlefour/ | archive-date = 4 September 2009 | url-status = dead}}</ref> The global pass rate for the IB diploma is approximately 80%.<ref>{{cite web |title=21 Things You Should Know about the IB |url=http://www.ibo.org/facts/21things/documents/21thingsyoushouldknowabouttheIBMarch08.pdf |date=June 2007 |publisher=International Baccalaureate Organization |access-date=2 July 2009 |archive-url=https://web.archive.org/web/20090205081347/http://www.ibo.org/facts/21things/documents/21thingsyoushouldknowabouttheIBMarch08.pdf |archive-date=5 February 2009 |url-status=dead}}</ref> In order to receive an IB diploma, candidates must receive a minimum of 24 points or an average of four (or C) out of a possible seven points for six subjects. Candidates must also receive a minimum of 12 points from their Higher Level subjects and a minimum of 9 points from their Standard Level subjects. Additionally, candidates must complete all of the requirements for the EE, CAS and TOK. Failing conditions that will prevent a student from being awarded a diploma, regardless of points received, are non-completion of CAS, more than three scores of 3 or below (HL or SL), more than two scores of 2 or below (HL or SL), a score of 1 in any subject (HL or SL), not meeting the specific points required for Higher Level (12) or Standard Level (9) subjects, grade "E" awarded for theory of knowledge and/or the extended essay, or a penalty for academic misconduct from the Final Award Committee.<ref>{{cite web|url=https://resources.finalsite.net/images/v1611559177/basel/szoxmgau61cey3emc91v/DP-General_regulations.pdf|title=General regulations: Diploma Programme|work=ibo.org|access-date=25 November 2022}}</ref>
Candidates who successfully complete all the requirements of the IB Diploma Programme and one or more of the following combinations are eligible to receive a bilingual diploma: two [[IB Group 1 subjects|Group 1]] subjects (of different languages), a Group 3 or 4 subject taken in a language other than the candidate's Group 1 language, or an Extended Essay in a Group 3 or Group 4 subject written in a language other than the candidate's Group 1 language.<ref>{{cite web |title=A guide to the IBDP for universities and colleges: How to interpret IB grades and transcripts |url=http://www.ibo.org/diploma/recognition/guide/slidef.cfm |publisher=ibo.org |access-date=2 July 2009 |archive-url=https://web.archive.org/web/20090721162419/http://www.ibo.org/diploma/recognition/guide/slidef.cfm |archive-date=21 July 2009 |url-status=dead }}</ref> IB transcripts are issued to indicate completion of diploma courses and exams for non-diploma candidate students.<ref>{{cite web |title=Frequently Asked Questions: IB Diploma Programme |url=http://www.ibo.org/ibna/educators/diploma_faq.cfm |publisher=ibo.org |access-date=2 July 2009 |archive-url=https://web.archive.org/web/20090901161703/http://www.ibo.org/ibna/educators/diploma_faq.cfm |archive-date=1 September 2009 |url-status=dead}}</ref>
