We can learn through observation by writing important details that cannot be notice on a standardized test. Observation is a tool to help us learn about each child, our environment, and our work in caring for children. Also it helps the teacher to identifying the source of a problem (not just the individual child but also his or her environment and the children associated with him/her). Other means of assessments are done once a year. While observing a child you can repeat observations over a period of time can show how a child's development is progressing.
The value of observation is very important to anyone that is in contact with a child to have better understanding of their strength and abilities. Teachers/educators can help a child in a timely manner while other assessments you need to wait for the information to arrive and this could take about six months to a year and sometimes it can jeopardize the child’s