On a previous assigning system I used, I could send a message to my officials allowing them to apply to games. Then, at my discretion, I could access the available games, see who applied, and complete assigning. This helped reduce declined games and availability issues. It also allowed me to work within a single tool rather than having to bounce back and forth between the assigning tool and my email.
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After four years of use with another assigning tool, this TBA function has become second nature to many officials.