T
 
Task Analysis
Process by which an instructional designer (through observation, questionnaires, focus group sessions, or one-on-one Q&A with an SME) extrapolates the steps necessary to perform a skill or to build knowledge. This identifies learning objectives and sequence of instruction.

TBT
Technology-Based Training is an all encompassing term that can include anything from online learning to CD-ROM, and uses technology for learning, usually outside the classroom.