Psychology 9-1 GCSE - 

2.1.4 - Understand the active process of memory through the Theory of Reconstructive Memory (Bartlett, 1932), including strengths and weaknesses of the theory:

a) How schemas are formed - 

Barlett believed schemas were formed by our experiences and how we interpret them, these give us a set out frame and point of view on things.

b) How schemas influence memory - 

As memory is reconstructive, parts of your memory can changed if it is influenced to by your schema, and if not changed then you often add on details you didn't necessarily sense or know because it's what makes sense with your schema.