Here is the design of a clinical trial:

Official Title: Cognitive Remediation Group Therapy to Improve Older Adults' Ability to Cope With HIV-Associated Neurocognitive Disorder (HAND)

Included conditions:
- HIV/AIDS
- Aging
- Mild Cognitive Impairment
- Group, Peer

Study Armgroups:
- {'label': 'Cognitive remediation group therapy', 'type': 'EXPERIMENTAL', 'description': '8 weekly 3-hour sessions of CRGT', 'interventionNames': ['Behavioral: CRGT']}
- {'label': 'Mutual aid support group', 'type': 'ACTIVE_COMPARATOR', 'description': '8 weekly 3-hour sessions of HIV group therapy', 'interventionNames': ['Behavioral: HIV group therapy']}

Interventions:
- {'type': 'BEHAVIORAL', 'name': 'CRGT', 'description': 'Cognitive remediation group therapy (CRGT) will be comprised of 1/3 brain training exercises on tablets using PositScience software by BrainHQ and 2/3 mindfulness-based stress reduction (MBSR) involving various activities such as meditation, breathing exercises, etc. Intervention will comprise of 8 weekly 3-hour sessions.', 'armGroupLabels': ['Cognitive remediation group therapy']}
- {'type': 'BEHAVIORAL', 'name': 'HIV group therapy', 'description': 'These groups use a model of mutual aid to encourage peer-based discussion on the effects of living with HIV. Topics are determined by the group; facilitators ensure that safety is maintained throughout and make connections between participants as appropriate. Intervension will comprise of 8 weekly 3-hour sessions.', 'armGroupLabels': ['Mutual aid support group']}

Primary Outcomes:
- {'measure': 'Feasibility - Session Attendance', 'description': 'Number of Participants who Attended at least 80% of the Group Sessions.', 'timeFrame': 'Three months'}
- {'measure': 'Acceptability - Participant Satisfaction With Group Sessions', 'description': 'Participants will complete the Helping Characteristics of Self-Help and Support Groups Measure that will be complemented by questions about session length, number of sessions, activities used, and evaluation of facilitators.\n\nThe Helping Characteristics of Self-Help and Support Group Measure contains 22 items that are scored on a 5-point-Likert style scale for a minimum score of 22 and a maximum score of 110. Higher scores indicate better outcome (outcome being satisfaction with support group). There are no subscales.', 'timeFrame': 'Three months'}

Please estimate the sample size based on the assumption: 
Not explicitly stated, but the sample size is based on the ideal size for 8 weeks of group therapy and the proportion of the sampling frame.
Sample size
        A sample size of 12â16 participants (6â8 in each study arm) has been selected as (1) 6â8 participants have been found to be an ideal size for 8âweeks of group therapy40; and (2) this number can provide preliminary insight into the feasibility and acceptability of the novel CRGT arm before initiating a larger study. Further, 12â16 participants are 30% to 40% of the sampling frame (n=40). So, if this pilotâs results prove promising, scale-up to a larger study with similar recruitment proportions would feasibly require a sample of 90â120 from approximately 300 potential participants.