About control

5 types of control

1. At the end, right before a deadline. High confidence a person can and will do the task. Also, small tasks are good candidates for that.
2. Preliminary
3. Each milestone
4. Periodic. Every N units of time (every day, week, month). Depends on a task
5. Selective, Random; when there are too many items to check for quality, e.g. as on the conveyor: a random bottle is open for a check, not every bottle.

Charts

1. At the end

flowchart LR
Start-->Work-->Check(🔍)-->Deadline

2. Preliminary

flowchart LR
Start-->Check(🔍)-->Work-->Deadline

3. Each milestone

Milestone-related: a check is tied to reaching a milestone, not to the clock.

flowchart LR
Start-->M1(🔍)-->M2(🔍)-->M3(🔍)-->Deadline

4. Periodic

Time-boxing related: a check happens every N units of time, regardless of progress.

flowchart LR
Start-->Day1(🔍)-->Day2(🔍)-->Day3(🔍)-->Deadline

5. Selective, Random

flowchart LR
T1(task)-->Done
T2(task)-->Check(🔍)
T3(task)-->Done2(Done)
T4(task)-->Done3(Done)