4 ways external testing can be a profitable boost for digital agencies

We all know that feeling of reading a proposal over so many times you begin to read what you know it should say, rather than what is written. Your eyes adjust and you simply cannot see the mistakes; the same concept applies to Testing.
As the basics of any Testing qualification will teach you, testing externally is more efficient and having the guys who built it do the testing is the least effective thing to do.
From project fatigue to simple bias of idea contribution, there are many reasons why