Self-induced anaerobic fermentation, abbreviated SIAF in the source, describes an approach to managing fermentation conditions during coffee processing. The useful question for a buyer is how that term is applied to a particular lot. An acronym alone does not supply a complete production protocol.
Look for the producer's explanation of the coffee material used, the fermentation environment and the subsequent drying or washing stages. Avoid assuming that every coffee carrying the term underwent identical conditions or will have identical flavours. Processing can be an important part of the story without replacing variety, growing conditions and careful handling.
When tasting, describe the cup before using the processing label as an explanation. Note fruit-like or fermented impressions alongside sweetness, clarity and finish. Brew a small, repeatable comparison with a familiar coffee if the style is new to you. A novel technique is worth understanding, but novelty by itself should not be treated as proof of better quality.
The conversation
A good question can make a better brew.