Flow and the portfolio
Load and mix are portfolio choices.
Value stream management starts with a useful shift: look past individual projects to the whole path from an idea to value in a customer’s hands, across every team and tool on the way. Work is organized around long-lived value streams, and flow is measured end to end. Flow metrics such as flow time, flow efficiency and flow load show how long work takes, how much of that time is spent waiting and how much is in progress at once.
What flow metrics leave to the organization is how much work should enter each stream in the first place. When flow time keeps growing, the cause is often less about slow teams than about too much started at once. Every new item competes with everything already in the stream, and past a point, adding work makes all of it finish later. Flow load is largely set by how much work is allowed to start.
The mix of work raises a similar question. A common way to describe it is features, defects, risks and debt, and seeing how a stream’s work splits between them often surprises leaders: a stream seen as a feature engine may spend much of its time fixing and maintaining. Neither kind of work is wrong, but the mix should be chosen rather than inherited. That choice, like the load, belongs to portfolio planning.