goal attainment scaling

Standard outcome measures ask the same questions of everyone, which is fair but can miss what a particular person most wants. One stroke survivor's dearest goal is to hold their grandchild; another's is to return to driving. A fixed questionnaire may not capture either. Goal attainment scaling, often abbreviated GAS, flips this around: instead of a ready-made scale, the team and the person build a personalized scale for each individual goal, then measure whether that exact goal was reached.

Here is how it works. For a chosen, meaningful goal, the team writes down, in advance, a small ladder of possible outcomes. The expected level — what is realistically likely with treatment — is given a value of 0. Doing somewhat better than expected is +1, much better is +2; doing somewhat worse is -1, much worse is -2. The descriptions are made concrete and observable ('walks 50 metres with a cane' rather than 'walks better') so that anyone can later judge which rung was reached. After the treatment period, the team scores where the person actually landed, and these scores across several goals can be combined into a single overall figure if needed.

GAS matters because it keeps rehabilitation honest to its own promise — that goals should be meaningful to the person, set in partnership, and specific enough to know when they are met, which is exactly the spirit of SMART goal-setting. It is especially valuable for highly individual situations that no standard measure fits well. Its honest weaknesses are real: writing good, unbiased levels takes skill and time, the same person setting and scoring the goals can unconsciously tilt the result, and because each scale is bespoke, GAS scores are not straightforwardly comparable between different people. It is a tool for measuring this person's progress toward this person's goals, not a universal yardstick.