There is a growing consensus that professional action in occupational rehabilitation should be research-based, and that practice-based knowledge is needed to achieve contextual insight and new theoretical understanding. Few study design examples exist to help inform an evaluation plan and develop research-practice interactions to examine process complexity of targeted occupational rehabilitation programs. This study design article is a proposal on a theory-driven and interactive research methodology for a process evaluation of a pragmatic intervention trial, known as STAiR. The aim of the process evaluation is to examine the delivery and implementation of an inpatient and an outpatient occupational rehabilitation program, and explore active mechanisms pertaining to patient experiences of the return to work (RTW) process. Qualitative and interactive data collection methods will include (a) participant observation of program setting and activities; (b) participatory dialogue conferences with program providers to facilitate initial logic modelling; (d) individual patient interviews at program intake and follow up; and (d) focus groups with rehabilitation teams and external stakeholders. The qualitative data will be supplemented with description of program activities and patient questionnaires. Program logic modelling is suggested to inform a logic analysis of how expected RTW outcomes and delivery of program activities are aligned and how contextual characteristics may clarify differences in achieved RTW outcomes. The proposed process evaluation approach may inform future design discussions and theoretical understanding, and it is expected that the applied knowledge gained through this study may help rehabilitation professionals better navigate potential challenges in clinical evaluation efforts.

Diverse and well-preserved acritarchs are reported from the type section of the Cambrian Hanford Brook Formation at Hanford Brook, southern New Brunswick. This section fills an important gap in acritarch studies by providing the first detailed picture of changing acritarch associations close to the traditional lower–middle Cambrian boundary in Avalonia. Acritarchs from the St Martins Member, at the base of the succession, include Skiagia ciliosa, Heliosphaeridium notatum, H. longum and Liepaina plana and suggest attribution to Cambrian Stage 4. Acritarchs from the Somerset Street Member, in the middle of the formation, include Eliasum llaniscum and Comasphaeridium silesiense. This information adds new biochronological context to an ash bed in the Somerset Street Member previously dated as c. 510 Ma or 508 Ma, and to the endemic trilobites from the same member, including Protolenus elegans. It also places absolute ages on the basal range of stratigraphically important acritarchs. Both the acritarch assemblage and the radiometric age are consistent with a position very close to the traditional lower–middle Cambrian transition and likely within Cambrian Stage 5. Acritarchs from the Long Island Member, at the top of the succession, include additional taxa demonstrating assignment to Cambrian Stage 5. Both the Somerset Street and Long Island members probably correlate with the Morocconus notabilis Zone. The new acritarch species Retisphaeridium striatum Palacios is described. New data are presented on acritarchs from the upper part of the Hell's Mouth Formation, Wales, and correlation proposed with the Long Island Member.