Tell me more about the chasm attack vs. defend strategy?

The chasm attack vs. defend strategy is a concept from Geoffrey Moore's book "Crossing the Chasm". It's a marketing strategy for technology companies, particularly for startups.

The "attack" part of the strategy involves identifying and focusing on a specific niche market (the beachhead) that can be dominated quickly. The product should be tailored to meet the needs of this niche market. The goal is to gain a foothold and establish credibility in the market.

The "defend" part of the strategy involves expanding from the initial niche market to adjacent markets. This is done by leveraging the credibility and customer base gained in the initial niche market. The goal is to gradually expand market share and avoid direct competition with larger, more established companies.

The strategy is called "chasm" because it addresses the difficult transition (the chasm) from the early market dominated by a few visionary customers to the mainstream market dominated by a large number of customers who are driven by practical considerations.