Under the strategy, 2 types of workers do not need work permits for short term work:

highly skilled workers
researchers

Highly skilled workers

These workers must meet both of these requirements:

Their job is classified under Training, Education, Experience and Responsibilities (TEER) category 0 or 1 in the National Occupational Classification (NOC).
They will work for only one of the following short periods of time:
up to 15 consecutive days once every 6 months
up to 30 consecutive days once every 12 months

Researchers

These workers must meet both of these requirements:

They will perform research at a Canadian, publicly funded, degree-granting institution or its affiliated research institution.
They will work for 1 period of 120 days in Canada once every 12 months.