Systems
The five system constraints that lock your value
Your options are set by conditions, not by how hard you are working.
Theory of constraints says a system has one binding constraint at a time, and improvement anywhere else is waste. It is forty years old, it is boring, and it is the single most useful idea I have applied to my own career.
Here are the five that determine what a professional can actually do next.
Market value is the clearing price for your skill set. Not what you are paid, which is a historical artifact of a negotiation you probably lost. What someone would pay today, and how many people are looking.
Transferability is how much of your value survives leaving. If your expertise is in an internal tool, a proprietary process, and a set of relationships that all report to the same building, your value is real but it is not portable.
Assets and leverage are what work when you are not working. Documented methods, reputation that precedes you, an audience, anything you own. This is the line item almost nobody has counted, and it is usually the one with the most room in it.
Runway is months of flexibility. It is the least glamorous condition and it quietly sets the ceiling on every other one, because a person with three months of savings cannot take a path that pays in nine.
Momentum is whether the other four are moving. Two people with identical conditions are in different situations if one is compounding and the other is holding still.
The reason this matters more than another framework: only one of these is binding for you right now. Find it, and the next ninety days become obvious. Skip that step, and you will optimize something that was never the problem.