First impressions usually imply the way in which people first see others by applying the assumptions on some of the features that an individual has. Research has shown that it takes ten seconds to create an impression on someone.The first information we have about a person has a disproportionate influence on the opinion we create about them. There are various factors that influence the way we form first impression about someone, such as physical appearance, sexual attraction, verbal and nonverbal communication, and so forth. The impression we form can be either, true or false. Stereotypes, halo effects, and implicit personality theories can be the cause of people's misjudgment.The first impressions are very importan, especially in the business world and during the practice of social work. First impressions that social workers make on their clients are very important as well as the ones they make about their clients. If, we after all leave a bad first impression, it is important to know that even though it is extremely stable at beggining, the first impression can be changed. Given that sometimes we will not get a second chance to make better impression it is important to be aware of our possible mistakes and base our conclusions on all available information so that the first impression we make on others and the one others make about us are accurate and more complete.