Answer: casual observation.
Explanation: Casual observation involves no set routine, just basic wildlife watching. Casual observations is very important as it provide very valuable data and should not be overlooked. Casual observation is a systematic data collection approach by just watching. Researchers use all of their senses to examine people in natural settings or naturally occurring situations. For example, While watching your kids play in the backyard, you get some ideas about what factors may be causing them to compete or collaborate is an example of casual observation
