This document assembles guidance and instructions to support users of StEER’s mobile apps. The primary user base is StEER members participating in Field Assessment Structural Teams (FASTs); this guidance should be at minimum reviewed by all Level 2, 3 or 4 StEER members eligible to deploy to conduct field assessments. This guidance document introduces the StEER Apps with emphasis on core functionalities and required fields; Appendices provide additional information and guidance on observations that are field priorities. In addition to this document, StEER will be releasing videos to assist in training users on these apps. These will be available at https://www.steer.network/resources. StEER has also created a Mobile App Quick Reference Sheet (QRS) available at this website to summarize the key aspects of this guidance document.