Table 1.

Summary of intervention components

Time	Content	Behaviour change technique/construct/label
Call 0 After randomisation	Brief scene setting telephone call Introduce counsellor. Prepare for sessions and agree dates for future sessions
Session 1 Within first few RT treatments	Assessment of current energy state Clarify patterns, causes and impacts of fatigue Identify individual goals and concerns and the meaning of fatigue for this person’s life during RT Assess readiness to change Consider barriers to change Set three ‘SMART’ goals • Activity and sleep diaries and booklet • Education about fatigue and radiotherapy • Emotional support and encouragement	KNOWLEDGE—of antecedents and health consequences EMOTION—self-assessment of affective consequences BEHAVIOURAL REGULATION—self-monitoring of behaviour BELIEFS ABOUT CAPABILITIES—verbal persuasion to boost self-efficacy Goal setting (outcome and behaviour) Action planning (including implementation intentions
Session 2 Week 2 of radiotherapy	Review of fatigue state Review of diary Guidance with how to manage fatigue and meet goals Prioritisation of activities Best utilisation of upcoming radiography review clinic	GOALS—review of outcome and behaviour goals BEHAVIOUR REGULATION—self-monitoring of behaviour BELIEFS ABOUT CONSEQUENCES—comparative imagining of future outcomes INTENTIONS—commitment GOALS—review of outcome goals Increased self-efficacy, control and positive mood
Session 3 Week 3 of radiotherapy	Looking to end of treatment and beyond Weekly planner and diary review Modification of activity and goal scheduling Positivity Self-efficacy Social support	BEHAVIOUR REGULATION—self monitoring of behaviour GOALS—review behaviour goals Goal setting—outcome and behaviour goals Encourage self-monitoring and modification of goals; INTENTION—commitment Identification of ambivalent/unhelpful thoughts about end of treatment and beyond; enhancement of approach coping by adopting alternative thoughts Incremental increase in activity levels to achieve goals; normalisation after treatment OPTIMISM—verbal persuasion to boost self-efficacy EMOTION—reduce negative emotions SOCIAL INFLUENCES—social support or encouragement (general)