Triangulation work is carried out in following steps.
1. Reconnaissance
2. Erection of Signals & Towers
3. Measurement of Horizontal Angles
4. Astronomical Observations Necessary to Determine the True Meridian and the Absolute Positions of the Stations
5. Measurement of Baseline
6. Adjustment of observed Angles
7. Computations of Lengths of each side of each 
8. Computations of the Latitude and Longitude of ST

1. Reconnaissance:
In geodetic Surveying, reconnaissance consists of:
1. Examination of the country to be surveyed.
2. Selection of most favorable sides for base lines
3. Selection of suitable positions of  station
4. Determination of indivisibility of station

2. Selection of Station:
The selection of station is based upon the following consideration.
1. The stations should be clearly visible from each other. For this purpose highest commanding positions such as top of hills or mountains is selected.
2. They should form well shaped triangles
3. They should be easily accessible
4. They should be useful for detail survey
5. They should be so fixed that the length of sight is not too short or too long

3. Inter-visibility and Heights of Stations:
For indivisibility of two stations they should be fixed on highest available ground. Such as mountain peaks rides or top of hills when the distance b/t the two stations is great and the difference in elevation b/t them is small then it is necessary to raise both the instrument and signal to overcome the curvature of the earth and to clear all the intervening obstruction.
The height of both the instrument and signal above the ground depends upon.
1. Distance between the stations.
2. Relative elevations of stations.
3. The profile of intervening ground.