In New Zealand, Psychologists fall under the New Zealand Psychological Society and have a code of ethics to adhere by.
Psychologists should not be confused with Psychiatrists who are doctors who specialise in psychiatry. Psychiatrists can prescribe drugs to assist patients, whereas psychologists cannot and use other methods to assist people.
All Registered Psychologists, no matter the above specialisation, fall under the Psychologists Code of Ethics and the Health and Practictioners Competence Assurance Act 2003.
The Health and Practitioners Competence Assurance Act provides a framework for the regulation of health practitioners in order to protect the public where there is a risk of harm from the practice of the profession.
The discipline of Industrial and Organisational Psychology applies the psychology of individuals and groups in organisations and the workplace.
I/O psychologists are trained in the scientist-practitioner model, meaning they should apply scientifically proven approaches to the practice of psychology within organisations. A key part of an I/O Psychology degree is learning about statistics and research methods.
There are some very good assessment tools that are restricted to people who have extensive psychological training and are Registered Psychologists due to their complex nature.
The reason for this is that they would potentially be dangerous in the hands of non-psychologists who lack the training and ethical responsibilities to use these tools appropriately.
These tools are more in-depth knowledge about psychometrics in order to interpret them correctly.
Due to their complexity these tools can provide psychologists with more robust and indepth information about people and their preferences than some non expert tools that anyone can be trained in.