Strength-based assessment can enhance clinical clarity, improve the range of information, and provide a more complete picture of clients and their circumstances. Deficit-oriented assessment has improved the assessment and treatment of a number of disorders but, at the same time, has created a negative bias, considered strengths as clinical peripheries or by-products, tended to reduce clients to diagnostic categories, and created a power differential, which could be counterproductive to clinical efficacy. Strength-based assessment explores weaknesses as well as strengths to effectively deal with problems. We present a number of strength-based strategies for use in clinical practice. These strategies, we hope, will help clinicians to operationalize how strengths and weaknesses reverberate and contribute to a client's psychological status, which is comprehensive and guards against negative bias.

We know little about the outermost exoplanets in planetary systems because our detection methods are insensitive to moderate-mass planets on wide orbits. However, debris discs can probe the outer-planet population because dynamical modelling of observed discs can reveal properties of perturbing planets. We use four sculpting and stirring arguments to infer planet properties in 178 debris-disc systems from the ISPY, LEECH, and LIStEN planet-hunting surveys. Similar analyses are often conducted for individual discs, but we consider a large sample in a consistent manner. We aim to predict the population of wide-separation planets, gain insight into the formation and evolution histories of planetary systems, and determine the feasibility of detecting these planets in the near future. We show that a ‘typical’ cold debris disc likely requires a Neptune- to Saturn-mass planet at 10–100 au, with some needing Jupiter-mass perturbers. Our predicted planets are currently undetectable, but modest detection-limit improvements (e.g. from JWST) should reveal many such perturbers. We find that planets thought to be perturbing debris discs at late times are similar to those inferred to be forming in protoplanetary discs, so these could be the same population if newly formed planets do not migrate as far as currently thought. Alternatively, young planets could rapidly sculpt debris before migrating inwards, meaning that the responsible planets are more massive (and located farther inwards) than debris-disc studies assume. We combine self-stirring and size-distribution modelling to show that many debris discs cannot be self-stirred without having unreasonably high masses; planet- or companion-stirring may therefore be the dominant mechanism in many (perhaps all) debris discs. Finally, we provide catalogues of planet predictions and identify promising targets for future planet searches.

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