What should we do next?

Working direction. Make the assumptions behind each longevity programme explicit. Different accounts of the difficulty call for different work; keep alternatives available until evidence distinguishes them.

Still unresolved. Which obstacles are failures of implementation, which require new methods, and which require a different account of ageing?

Next work. Use the spectrum to state the assumption behind a programme, then identify one observation that would make us change that assumption.

Reconsider when. A repeatable result that a simpler approach cannot explain, or a simpler intervention that achieves the required function, would change where effort belongs.

Working direction. Choose tests for how much they can change a decision. Compare the predictions of several explanations before committing to one.

Still unresolved. Which feasible observation would separate the explanations, and would that distinction actually change the next intervention or study?

Next work. Compare the published predictions in the linked research example. Define shared conditions, controls and a decision rule before treating them as a study design.

Reconsider when. If explanations predict the same observation, the proposed test needs revision. If a result would not change the programme, another uncertainty may deserve priority.

Working direction. Describe the chain from an idea to a useful capability. Identify the dependency that currently prevents the next step, and distinguish it from the other unfinished work.

Still unresolved. Is progress waiting on knowledge, a tool, execution capacity, resources or a decision outside the laboratory?

Next work. Name the blocked step, what it depends on, and the observable condition under which it could proceed.

Reconsider when. If removing the suspected obstacle does not allow the next step, revise the dependency map instead of repeating the same intervention.

Working direction. Connect the ambition of longer life to a person and to a concrete choice. Publish arguments whose assumptions can be challenged, rather than treating attention as agreement.

Still unresolved. Which arguments change durable choices, rather than only attracting attention?

Next work. State the choice an essay or visual argument is intended to change, and how we would tell whether that change occurred.

Reconsider when. If an argument attracts attention without changing the intended choice, revise the argument or the proposed route from understanding to action.

Working direction. Work backwards from the next required capability to the actor and setting able to deliver it: research, clinical practice, institutions, resources or culture.

Still unresolved. Which setting controls the next dependency, and what can actually be changed there?

Next work. Connect the bottleneck to an actor, a decision and a verifiable milestone. Use that chain to choose where to act.

Reconsider when. Move the focus when the dependency is resolved or the proposed actor cannot change it. Keep the goal stable while revising the route.