• Lack of Self-Awareness: This is one of the main problems with personality tests. This is probably because individuals who answer questions are not aware of their deep patterns of thoughts, emotions, or behaviours. There might be wrong judgements or perceptions. As a result, if you do a test a few weeks after your initial attempt, you can get different results. This will result in  Inconsistency in Results. 
• Bias: Besides lack of awareness and understanding in doing tests, individuals might be biased about their behaviours. They might overrate their patterns of thoughts, feelings, and actions to represent their desired self. Therefore, wrong inputs will lead to  Unreliability. 
• Labelling People: This is the third, and probably the biggest, problem. Personality tests put people in inboxes and label them. This might lead to more limitations. Why? Because after doing these tests, individuals may underestimate their abilities to change what results claimed about them. Since they are labelled, they might not want to change their patterns of thoughts, emotions, and behaviours.

Dr. Alireza Sharifi

www.dralirezasharifi.com