I am a huge fan of a SIPOC which stands for suppliers-inputs-process-outputs-customers. A SIPOC diagram is a quick broad overview of all the elements of a process and serves as a great visual tool.
Start with the process
Provide the key steps of the process in the middle column and briefly describe its key steps. A SIPOC diagram is a high-level process map and is designed to get a birds-eye overview of the process. Do not include decision points or feedback loops.
Identify the outputs of the process
Focus on the key outputs of the process. In this step, write down the three or more main outputs. Use nouns for the most part and avoid categorizing your outputs into good or bad ones – that’s not the point of the diagram.
Identify the customers
List the people who benefit from the process. These don’t have to be the literal “customers.” E.g., if you are working on a diagram for an internal process, the “customers” are your coworkers. Think of who benefits from this process. Who would be upset if the process is not complete?
List the inputs for the process
List the inputs required for the process to function properly. Just like with every previous step, focus on the most important ones. Three to six main inputs should do.
Identify the suppliers of the inputs
List the suppliers based on what inputs the process uses. Be sure to mention any specific suppliers whose input has a direct influence on the output.
Investigations of a Dog 
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