HOBSCOTCH-MS-Efficacy Trial

Inclusion Criteria: * Inclusion Criteria - MS Participant * Age 20 - 75 years * Diagnosis of relapsing or progressive MS * Education of at least Grade 12 or GED * Fluent in English * Subjective cognitive and memory challenges * Internet access * Telephone access Inclusion Criteria - Caregiver Participant * 20 years + * Fluent in English * Caregiver to a MS Participant * Participant MS has given permission to Caregiver to enroll with them * Internet access * Telephone access Exclusion Criteria: * Exclusion Criteria MS Participant * Current diagnosed psychiatric disorders (e.g., schizophrenia, bipolar disorder or substance use disorder). * Other neurological disorder such as epilepsy, brain tumor, severe brain injury or mild to moderate brain injury with a history of 30 or more minutes' loss of consciousness, or other disorder that would confound the focus on MS * Diagnosed developmental attention, learning, or intellectual disorder; sensory, motor, or physical disability that would prevent engagement with the intervention or render the person unable complete study outcome measures * Exacerbation of MS symptoms (relapse) or ongoing steroid treatment within three months of study enrollment * Significant visual impairment precluding reading or writing * Lack of access to the technical resources (e.g., internet access, telephone) required for participation Exclusion Criteria - Caregiver Participant * Significant visual impairment precluding reading or writing * No reliable telephone or internet access