If any part of the business process specification is absent in the following description, feel free to mention the assumptions you are making explicitly. For better visualization of the step-by-step extensions in the model, please create new representations of the process models for each phase. For example, redraw the process model created in "a" for solution "b," and redraw the process model created in "b" for solution "c." It is not necessary to use a specific tool for drawing the models; you can create them by hand and upload them as long as they are legible.

1. Every year at the start of December, the clerk in the Strategy Department of a manufacturing company, requests the yearly performance report from the Operations Department. When the report is received, the clerk reviews the report format and content; and if it is adequate, the control process ends. If not, the clerk sends a list of suggested corrections to the Operations Department, and the sequence of activities are repeated starting with the Request Performance Report task. Model the Operations Department as a black-box pool in the collaboration diagram where the clerk is a role within another pool for the Strategy Department.
2. Make an extension in your model such that after requesting the performance report, the clerk in Strategy Department waits to receive either the performance report itself or a timeout if the report does not arrive in five days, whichever happens first. If the report arrives, the process goes as designated in a. If it has not arrived in five days, the clerk notifies the Strategy Department head and the sequence flow is redirected to Request Performance Report task.
3. Suppose that the Operations Department sometimes discovers that their Performance Report has flaws and sends a message to withdraw the report while it is still being reviewed. Model this on top of your model in b as an external exception event, where the sequence flow is redirected to Request Performance Report task after a 2-day delay (given for corrections).