Inclusion Criteria:  Diagnosis of MS, received ≥3-months pre-enrolment (allowing for acute adjustment, as per other trials of cognitive rehabilitation) Age 18-89 (to meet the standardisation criteria of psychometric assessments) Cognitive difficulties as assessed by Perceived Deficits Questionnaire (PDQ) self-report (≥27) and Repeatable Battery for the Assessment of Neuropsychological Status (RBANS) testing (≤1 standard deviation below normative reference-value) Able to read and speak English to standard necessary for completing assessment and intervention procedures Able and willing to access a computer/tablet/smart-phone with internet connection throughout the study Able and willing to give informed consent  Exclusion Criteria:  Currently receiving cognitive rehabilitation Previously received SMART training Vision or hearing problems precluding completion of procedures