This book constitutes the refereed proceedings of the 5th International Workshop on Ambient Assisted Living, IWAAL 2013, held in Carillo, Costa Rica, in December 2013. The 13 full papers and 7 short papers were carefully reviewed and selected from 23 submissions. The focus of the papers is on following topics: AAL environments, user interaction and assistive solutions, sensing and activity recognition, and key application domains.

Session 1: AAL Environments.- A Knowledge Based Framework to Support Active Aging at Home Based Environments.- Mobile Based Prompted Labeling of Large Scale Activity Data.- Mobile NFC vs Touch screen Based Interaction: Architecture Proposal and Evaluation.- Improving Health Services Using Cloud Computing, Big Data and Wireless Sensors.- Session 2: User Interaction and Assistive Solutions.- Focus Group Evaluation of Scenarios for Fall Risk Assessment and Fall Prevention in Two Countries.- Enhancing Social Interaction between Older Adults and Their Families.- Personalization of Serious Videogames for Occupational Engagement for Elderly.- Return to Activities of Daily Life: Physiotherapy Rehabilitation with Serious Game.- Image Analysis for Crack Detection in Bone Cement.- Session 3: Sensing and Activity Recognition.- Mobile and Context-Aware Grocery Shopping to Promote Active Aging.- Handling Displacement Effects in On-Body Sensor-Based Activity Recognition.- Application of a Cluster-Based Classifier Ensemble to Activity Recognition in Smart Homes.- A Vision System for Intelligent Monitoring of Activities of Daily Living at Home.- Session 4: Key Application Domains.- An Integral Medicine Taking Solution for Mild and Moderate Alzheimer Patients.- Human Facial Expression Recognition Using Wavelet Transform and Hidden Markov Model.- A Real-Time Insulin Injection System.- Development and Evaluation of an Augmented Object for Notifications of Particular Emails.- An Augmented Object Prototype for Helping to Prevent the Sudden Infant Death Syndrome.