Yes, it is acceptable and common to conduct individual brainstorming sessions in UX design. Individual brainstorming allows for exploring ideas freely, generating a range of possibilities, and diving deep into specific aspects. It provides the opportunity to think at one's own pace and consider different solutions before presenting them to others.
One common methodology for this is the use of mood boards. However, with the emergence of freely available AI tools, you can utilize AI to assist you in brainstorming ideas, both conceptual and visual.
Regarding Crazy 8, while similar to brainstorming, there are a few distinctions:
Time Constraints: Crazy 8 is time-limited (typically eight minutes), encouraging quick thinking and rapid ideation. Brainstorming sessions are usually open-ended without strict time limits.
Visual vs. Conceptual: Crazy 8 focuses on visual ideation through sketching, while brainstorming involves verbal discussions and collaborative idea generation.
Quantity vs. Depth: Crazy 8 aims for a high quantity of ideas in a short time frame, exploring diverse possibilities. Brainstorming allows for deeper discussions, exploring ideas from different angles, and evaluating feasibility.
Methodology: Crazy 8 has predefined rules, while brainstorming can be heavily moderated (starting by the original Osborn method) or unmoderated.
Participants: Crazy 8 ideally involves multiple participants (ideally four to 8), while brainstorming can be conducted with an ideal minimum of three participants or even individually.
Presentiality: Crazy 8 participants should be in the session at the same time, preferably in the same place (although you can use remote methodologies). In controlled brainstorming, it is recommended to avoid face-to-face contact to prevent distractions and blocking.