Ontario's "Guide to Effective Instruction in Writing" Section 4.4
Lots of great examples of these on Pinterest: https://www.pinterest.com/ggwelsh/ interactive-shared-writing-activities/?lp=true
Terrific example of how this might look for different classrooms/grade levels here: http://www.readingrockets.org/article/interactive-writing

Interactive Writing

Teacher Role
& Responsibility

Focuses lesson and writing task

Uses prompts/cues/think-aloud strategies
to support students

Revises text as changes are made
and mistakes are fixed

Student Role
& Responsibility

Helps decide purpose for writing

Can physically help write message
(depending on developmental stage)

Practice reading/revising message,
deciding on next steps

Revisit/use text independently as aid
for other writing tasks

Mindfulness in
Planning

Clear purpose/audience for writing

High-frequency words

Spelling resources (ie. Word Wall)

Letter-sound relationships

Upper vs Lower case letters

Sentence structure

Activities

Co-created writing on chart paper
(Step-by-step sentence creation)

"Today is...." (date, weather, feelings-based
responses)
Good way for Primary learners to practice
writing and expressing themselves or their
observations.

Sentence strips/word strips
Students create writing from pre-determined
language (useful for younger students, those
at lower developmental stages, ESL students,
students with IEP accomodations/modifications etc.)

SmartBoard writing
Allows instant revision, accessible for the
entire class, easy to manipulate

In the Classroom

Anchor charts (ie. grammar
and structure reminders etc.)

Word-Picture connections (ie.
classroom Pictionary) to facilitate
word recognition and communication

Positive reinforcement
& encouraging risk-taking

Respect for others (ie. helping
to fix mistakes, not putting
others down)

An excellent overview of the
"Interactive Writing" strategy,
and changes to the process as

we move up in grade level can
be found here:

http://www.readingrockets.org/article/extending-interactive-writing-grades-2-5