Table 1.

Outline intervention content

Modulesa	Description	BCR	ECR
Psychoeducation	In this module, participants are acquainted with the impact of fatigue, psychological distress, and cancer treatment on cognitive functioning. The module further offers comprehensive insights into cognition and its various domains. Additionally, this module introduces the operational methodology of the rehabilitation program.	▪	▪
Fatigue management	In the first part of this module, fatigue is explained, including factors that can contribute to its persistence. Participants gain insights into their fatigue levels and how daily activities affect their fatigue through registration tasks. In the second part of the module, participants learn and practice strategies to improve their energy balance.	▪	▪
Cognitive behavioral therapy	This module explores the association between negative beliefs and cognitive problems. Participants identify and examine their negative beliefs about cognitive functioning through registration tasks. Subsequently, cognitive behavioral therapy techniques are employed to replace these negative beliefs with more functional beliefs.	▪	▪
Communication	In this module, participants are encouraged to consider whether they would like to disclose their cognitive problems at work. They are guided to formulate the message they intend to convey. Additionally, attention is devoted to the manner in which the message is conveyed.	▪	▪
Strategy training: Information processing	The first part of this module explains how information processing works, including different types of difficulties that can arise. Participants gain insight into their information processing difficulties through registration tasks. In the next part of the module, participants learn and practice strategies to effectively manage information processing difficulties in their daily lives.		▪
Strategy training: memory	The first part of this module explains how memory works, focusing on the differences between working memory and long-term memory. Participants gain understanding of these memory processes and identify their own memory difficulties through registration tasks. In the second part of the module, participants learn strategies and practice them to effectively address memory difficulties in their daily lives.		▪
Strategy training: executive function	The first part of this module provides information on executive functions, explaining their nature and importance. Through registration tasks, participants identify their own challenges in executive functioning, gaining a comprehensive understanding of their individual difficulties. In the second part of the module, participants learn strategies to effectively manage executive functioning difficulties in their daily lives.		▪
Therapist guidance	Cognitive therapists offered online weekly guidance to participants through their personal accounts on the Internet platform. This guidance was facilitated through the use of assignment response fields and/or a messaging system.		▪

^aThe modules contained various features to enhance the learning experience, including infographics, informative videos, animations, and assignments.