What is the difference between interest groups and movements?

The main differences between interest groups and movements are as follows:

Interest Groups:

(i) They do not have a loose organisation.

(ii) Their decision making is formal.

(iii) They do not depend so much on spontaneous mass participation and are formed by people with a common interest and occupation.

Movements:

(i) They have a loose organisation.

(ii) Their decision-making is informal and flexible.

(iii) They depend much more on spontaneous mass participation.