Compare collecting information through observation and through document analysis. Describe a hypothetical situation in which each of these methods would be an effective way to collect information system requirements.

The observational method is one of the most used in the social sciences and has some curious aspects. On the one hand, it can be considered as the most primitive and, consequently, the most imprecise.

Documentary method is a type of research that uses primary sources, that is, data and information that have not yet been treated scientifically or analytically. Documentary research has specific objectives and can be a rich complement to bibliographic research.

The analyzed documents can be current or old, and can be used for historical, cultural, social and economic context of a place or group of people, at a certain moment in history. For this reason, it is a type of research widely used in the social and human sciences.

In the observational method, these games will be closely analyzed so that we can survey the information gathered from the observation of these children playing in schools.

In the documentary method, qualitative analyzes will be made about the given phenomenon, and it is also possible to make quantitative analyzes, when analyzing databases with numerical information

the earth’s crust is broken into separate pieces called tectonic plates (fig. 7.14). recall that the crust is the solid, rocky, outer shell of the planet. it is composed of two distinctly different types of material: the less-dense continental crust and the more-dense oceanic crust. both types of crust rest atop solid, upper mantle material. the upper mantle, in turn, floats on a denser layer of lower mantle that is much like thick molten tar.

each tectonic plate is free-floating and can move independently. earthquakes and volcanoes are the direct result of the movement of tectonic plates at fault lines. the term fault is used to describe the boundary between tectonic plates. most of the earthquakes and volcanoes around the pacific ocean basin—a pattern known as the “ring of fire”—are due to the movement of tectonic plates in this region. other observable results of short-term plate movement include the gradual widening of the great rift lakes in eastern africa and the rising of the himalayan mountain range. the motion of plates can be described in four general patterns:

collision: when two continental plates are shoved together

subduction: when one plate plunges beneath another (fig. 7.15)

spreading: when two plates are pushed apart (fig. 7.15)

transform faulting: when two plates slide past each other (fig. 7.15)