Formative assessment is amongst the highest of effect sizes. This product is Part I - planning formative assessment - of a three part continuum. This product, Part I, details the behaviors for teachers and students when planning the delivery of formative assessment. A practical, detailed and easily understood table describes the behaviors and identifies them as ideal, acceptable, and unacceptable e.g. what practices are ideal, acceptable and unacceptable when planning formative assessment. The reader may also be interested in Part II, the delivery of formative assessment, and Part III the follow-up after instruction.