Have available paper or notebook with writing materials to make a record of activities during an emergency. 
Suggested items to record:
     Name
     Unit and Location of Operation
     Date and Time -- From / To
     Notable or Critical Activities (Date and Time)
     Notes on Informal Messages/Traffic
     Copies of Formal Messages (See ARRL Radiogram Form listed below)
       -- Number
       -- Date and Time
       -- Sender
       -- Addressee
       -- Handling instructions
       -- Text of the message 
     List of items for follow up
     Equipment problems
     Information about other issues for followup
The following is a link to an:
Activity Log Example (ICS 214)