Function flow_velocity 

pub fn flow_velocity(items_completed: f64, period: f64) -> Option<f64>

Flow velocity: count of flow items completed per unit time.

Flow velocity is the Flow Framework’s throughput measure (chapter 2.3). It should always be reported alongside flow distribution — a rising item count can hide a shift toward rework or item-splitting gaming, so velocity alone is an incomplete picture.

Arguments

• items_completed — count of flow items completed in the period.
• period — length of the observation period (any consistent time unit).

Returns

Some(items per unit period), or None when period is zero.

Examples

use software_engineering::flow_framework::flow_velocity;

// 40 items completed in a 4-week period = 10 items/week.
assert_eq!(flow_velocity(40.0, 4.0), Some(10.0));
assert_eq!(flow_velocity(40.0, 0.0), None);