Data Entry Processing Clinical Data Assessment

I’m working on a data entry question and need an explanation and answer to help me learn.

Assessment Description

 explore the challenges associated with abstracting, normalizing, and reconciling clinical data from multiple disparate sources.  address the following:

Differentiate      between abstracting, normalizing, and reconciling data.

How are      data abstracted from clinical records?

Describe      the process of normalizing data.

1. Describe      the process of reconciling data.

What are      the challenges associated with using data from different sources?