The below principles are evidence-based principles for designing multimedia instructional contents. They can also be used as a checklist for your instructional media design.

For reducing extraneous processing

• Coherence: reduce extraneous material.

• Signaling: highlight essential material.

• Redundancy: do NOT add on-screen text to narrated animation

• Spatial contiguity: place printed words next to corresponding graphics

• Temporal contiguity: present corresponding narration and animation at the same time

For managing essential processing

• Segmenting: present animation in learner-paced segments

• Pretraining: provide pretraining in the name, locations, and characteristics of key components

• Modality: present words as spoken text rather than printed text

For fostering generative processing

• Multimedia: present words and pictures rather than words alone

• Personalization: present words in conversational style rather than formal style

Reference:

Mayer, Richard E. "Applying the science of learning: Evidence-based principles for the design of multimedia instruction." American psychologist 63.8 (2008): 760.