Sectional interest groups or pressure groups play a very valuable role in democratic politics, such as the following.
1.They represent some general or common interests that need to be defended
2.If one group put puts pressure on government to make policies in the way the first group desires.
Thus, the role of sectional interest group leads to a rough balance of power and accommodation of conflicting interests.

The following table shows the comparative analysis of sectional interest groups and public interest groups.

The struggles of Nepal and Bolivia can be viewed from different contexts as follows.
(a)The movement in Nepal was to establish democracy, while the struggle in Bolivia involved claims on an elected democratic government.
(b)The popular struggle in Nepal struggle was about the foundations of the country's politics, while the popular struggle in Bolivia was about one specific policy.
(c)Both these struggle were successful but their impact was felt at different levels.Nepal again became a democratic country.In Cochabamba, the water supply was restored at old rates.

In Bolivia, no political party led the movement which was against the government's move to privatise water.An organisation called FEDECOR was formed comprising various interest groups or pressure groups.These groups were local professionals, engineers, environmentalists, federations of farmers, factory workers' unions, middle class students of the University of Cochabamba and the homeless street children of the city.Only in 2006, when the Socialist Party gained power, a political party supported the movement.

The major difference between pressure groups and political parties, pressure groups do not  aim to directly control or share political power

Pressure groups and movements exert influence on politicals in variety of ways.
(i)They try gain public support and sympathy for their cause by carrying out information campaigns, organising meetings, filing petitions, etc.
(ii)By organising strikes and disruptions, they seek to make the government take note of their demands.
(iii)They also influence decision-making by lobbying.
(iv)The issues raised by theme often influence the policies of political parties.
(v)Formation of new political parties.

Pressure groups and movements exert influence on politicals in variety of ways.
(i)They try gain public support and sympathy for their cause by carrying out information campaigns, organising meetings, filing petitions, etc.
(ii)By organising strikes and disruptions, they seek to make the government take note of their demands.
(iii)They also influence decision-making by lobbying.
(iv)The issues raised by theme often influence the policies of political parties.
(v)Formation of new political parties.

Pressure groups and movements exert influence on politicals in variety of ways.
(i)They try gain public support and sympathy for their cause by carrying out information campaigns, organising meetings, filing petitions, etc.
(ii)By organising strikes and disruptions, they seek to make the government take note of their demands.
(iii)They also influence decision-making by lobbying.
(iv)The issues raised by theme often influence the policies of political parties.
(v)Formation of new political parties.

Pressure groups and movements exert influence on politicals in variety of ways.
(i) They try gain public support and sympathy for their cause by carrying out information campaigns, organising meetings, filing petitions, etc.
(ii) By organising strikes and disruptions, they seek to make the government take note of their demands.
(iii) They also influence decision-making by lobbying.
(iv) The issues raised by theme often influence the policies of political parties.
(v) Formation of new political parties.