Typed up on paper, printed out, and updated as needed. Six column across the top M-F and one column for upcoming. When M is finished, Tuesday becomes the first column and M is the next to last column. The job name, tel. #, and complaint are all I record (more detailed info. is on the inv. I write up). When a job is scheduled, I start a three part invoice and put the ticket in a folder that corresponds with the day. Plumber is given his tickets and the pink copy stays in the office. Pink copy is trashed when I get their paperwork back - it's also my safety for insuring every job is accounted for (payment/billing). (Forgot to add - as the jobs are being completed during the day, I use a highlighter to indicate such).
It's simple and I know what is going on at all times. Bonus, copy goes with me everywhere. If I get an after hours call, I can scedule without having to wait and get to the office. Hand write it on the schedule, update the computer version, and print out another one. I've scheduled calls while grocery shopping, driving, sitting on the beach, and even at a restaurant.