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Dental Sciences Guideline SOP - Conversion of Raw marks to CGS marks in IEMDS Using the Common Grading Scale Introduction The University of Aberdeen has a common marking scale which is used across all assessments. This scale consists of seven bands – A to G. Each band has associated ‘grade points’ (22 in total), which are then used to make any necessary calculations. Band Band point Grade point Band A 1 22 Excellent 2 21 3 20 4 19 5 18 B 1 17 Very good 2 16 3 15 C 1 14 Good 2 13 3 12 D 1 11 Pass 2 10 3 9 E 1 8 Weak 2 7 3 6 F 1 5 Poor 2 4 3 3 G 1 2 Very poor 2 1 3 0
Dental Sciences Guideline Use in written exams Most of our healthcare programmes written examinations will result in an overall percentage score. This must be converted to the university assessment scale. For exams where standard setting processes are used to determine the passmark, the marks will be mapped to CGS grade points after the exam using the provided guidance. For certain courses it may be appropriate to have a fixed conversion of percentages to CGS grade points. Use in clinical exams OSCE exams are assessed in two ways. Firstly, students must achieve the passmark at a certain percentage of stations in order to pass the exam. Secondly, students will receive a percentage score based on their marks across all stations. In the MBChB programme, students who do not achieve a pass in at least two- thirds of stations will be awarded a fail grade (<D3), with the grade point dependent on the overall number of stations failed. In the BDS course students must pass at least 50% of stations up to 2016 and thereafter 75%. In the PA course, 75% of stations in local examinations must be passed. Students who do not achieve the overall passing score will also be awarded a fail grade (<D3). As each OSCE is standard set, percentage marks will be mapped to grade points after the exam using the provided guidance. Use in essays and reports When marking essays, reports or theses, the examiner should first identify the band descriptor that best fits the work. They should then select the middle grade point from that band, and adjust this up or down depending on how well the student performance matches each descriptor. Descriptors must be available for each assessment.
Dental Sciences Guideline with the Assessment Lead or deputy. There can also be discussion at the Examiner’s Meeting. In a large cohort the distribution of CGS marks and the raw percentages typically assumes a fairly normal distribution. This is less likely in small cohorts but it is still to be expected that a small proportion will receive very high or very low marks and a larger number will cluster around the class mean. For some assessments, threshold conditions apply, such that a fixed or proportionate number of questions or OSCE stations are required to be passed, independent of the overall pass mark. Conversion levels for assessments (normalised percentages) Exam normalised A5 Normalised A MBChB Year 1 OSPE (ME2317) 91% 100% Year 1 OSCE (ME2510) 75% 82% Year 1 written (ME2508) 78% 85% Year 1 written (ME2308) 83% 92% Year 1 written (ME2017) 83% 92% Year 2 OSPE (ME3023) 80% 92% Year 2 OSCE (ME3024) 75% 85% Year 2 written (ME3009) 78% 85% Year 3 OSPE (ME3026) 80% 92% Year 3 OSCE (ME3025) 75% 80% Year 3 written (ME3019) 70% 80% Year 4 OSCE (ME4404 70% 75% Year 4 written (ME4403) 75% 80% Year 5 OSCE 70% 75% Dental All OSPE, OSCE, SBE 75% 80% Clinical Scenario papers 70% 75% ISCE final year 70% 75%
Dental Sciences Guideline
Dental Sciences Guideline 1 2. The worksheet labelled CGS Chart will automatically show a distribution curve of your exam results. The title can be overwritten to reflect the name of your course. These distribution curves should be made available to the exam board. Additional Checks a. Check for anomalies, for example, students who are attaining 80%+ in most questions being awarded 10% in another. This may be correct but may also indicate the wrong score has been entered. b. Does each SAQ provide a sensible distribution of grades? If most students are failing one question the question needs reviewed – either the pass mark adjusted or the question removed from the analysis. c. Check that no student has been awarded marks that exceed the maximum possible for that SAQ. d. All borderline fail SAQ papers should be double marked and any modifications noted on a spreadsheet that is then held by the Assessment Office. e. Make sure no student has been unfairly given a lower CGS due to rounding – look carefully at the borderline areas particularly at the fail and distinction borderlines. CGS award for students failing an OSCE (Including loss of one further point for students who fail on both passmark and number of stations). This must be inserted manually into the results spreadsheet. Where a student has failed the OSCE by number of stations failed only, the CGS grade shall be grade point 9 reduced by one grade for each station above the maximum number of stations a student is allowed to fail (e.g. a student failing one station more than the maximum allowed would receive grade point 8). Where a student has failed the OSCE by number of stations failed and by overall mark, a further one grade point will be deducted (e.g. a student failing one station more than the maximum allowed and by overall mark would receive grade point 7). Where a student has failed the OSCE by overall mark alone, the CGS grade shall be grade point 8 reduced by one grade for every complete 2% increment below the normalised passmark. (e.g. a student failing on
Dental Sciences Guideline overall mark alone with a mark 3% below the passmark would receive grade point 7). The minimum CGS grade for a student who has attended the examination is 3.
