The ECA process is best explained in 2 distinct stages.
The first process is identifying documents potentially relevant to your case. This may involve identifying custodians, data locations (computers, mobiles, social media, etc.) or date ranges.
The second process is narrowing the data identified by eliminating duplicates or running keywords, ensuing proportionality for your case.
Legastat’s fixed cost ECA process Overture can help you understand what you have, where you have it, and how much it is likely to cost.