Introduction Over the years political scientists have developed multiple theories to explain political events and outcomes. These theoretical approaches that will be discussed in this answer include Group Theory, Elite Theory, Incremental Theory, Rational-Choice Theory, Systems Theory. Each has a distinct focus and each suggests specific things about political life and policy Elite theory This theory views public policy as the preferences and values of the governing elite. It believes that people are passive, apathetic, and ill-informed about public policy. Initiative for public policy does not come from masses. The elite actually shape mass opinion into a policy question. Thus, public policy really turns out to be the preferences of elites. Public officials and administrators merely carry out the policies decided by the elite. In this model, policies flow ‘downward’ from elites to masses, they do not arise from mass demands. The theory allows for the smarter minority of individuals to be at the helm and thus ensuring the most efficient organisation of society. Dye (1981) summarises the implication of this theory as indicating that public policy reflects elite values, serves elite ends, and is a product of the elite. The corollary of this assumption is that the general citizenry or the masses are apathetic and illinformed and do not determine or influence policy through their demands or actions. So stated, elite theory is a provocative theory of policy formation because policy here, is the product of elites, reflecting their values and serving their ends, one of which may be a desire to provide in some way for the welfare of the masses. One other limitation of this model is that it assumes a highly structured and stratified society. In structurally diffused societies, elite formation and therefore, elite values and elite identity is relatively undeveloped. Group Theory According to group theory, interaction and struggle among different societal groups is the central facet of political life. Group is a collectivity of individuals distinguished by some common attribute or shared relationship. As per this theory, public policy is the product of group struggle. individuals having common interests and demands join hands with each other as a group to get the desirable policies made by the governments. The biggest strength of game theory is that the competition among groups does not permit any group to become absolutely powerful in a system for all times. They keep on checking the activities of each other. The group theory relies on the fact that there isn’t a monopoly of resources required to engage in this group conflict with only one group, while this may be true for some isolated cases, in reality however, especially in Africa and specifically in Nigeria, some groups could hold on to power perpetually and block all conceivable possibility of weaker groups from taking the full advantage offered by democracy. During actual policy-making, the government tends to tilt towards the groups that are gaining in influence. By contrast, in this theory, public policy moves away from the demands of the losing groups. Thus, public policy, at any given time, will reflect the interests of the dominant groups. The theory is so concerned with the role of groups that it leaves out the individuals and society in their analysis. While not disputing the fact that politics is a struggle between and among groups, one can also not forget that the role of particular individuals is a very important variable. Institutional Theory According to this view, public policies have their origin in governmental institutions such as legislatures, executives, courts, and political parties. A policy becomes a public policy, only when it is authoritatively determined by government institutions. Government gives legitimacy and universalistic character to a policy. Public policy is authoritatively determined, implemented, and enforced by government institutions. Thus, the relationship between public policy and government institutions is very close. Institutional approach is criticized for ignoring the living linkages between institutions and public policy. With the onrush of the behavioural revolutions in political science, institutional studies of the policy process were swept aside in favour of studies that relied more on the group, system, and elite–mass models. Incremental theory Incremental decisions involve limited changes or additions to existing policies. According to this approach, the policy-makers examine a limited number of policy alternatives and implement change in a series of small steps. There are very real limits of time, brains money etc. on administrator's understand complex problems and make different policies about them. Because of these limitations, the policy-makers, rationally, accept the past policies that satisfy them as legitimate and suffice to deal with the issue. Incrementalism is politically expedient because it is easier to reach agreement when the matters in dispute among various groups are only limited modifications of existing programmes rather than policy issues of great magnitude. Incrementalism is also realistic because it recognises that policy makers lack the time resources needed to engage in comprehensive analysis of all alternative solutions. In a nut-shell, incrementalism utilises limited analysis to yield limited, practical, acceptable decisions. Its limitations have been characterised as it being too conservative and antithetical to innovation and it is impotent under crisis situations, incrementalism does not eliminate the need for theory in policy-making, are some of the more enthusiastic advocates contend. Unless changes in policy are to be made simply at random or arbitrarily, some theory is needed to guide the action and to indicate the likely effect of proposed change. Rational Choice Theory The rational-choice theory involves applying the principles of micro-economic theory to the analysis and explanation of political behaviour. This approach is based on economic principles such as the cost-benefit analysis The rationalist model deals with construction of public policies that ensure better public policies. It thus aims at improving public policy-making process. It is the opposite of incrementalism. The rationalist model deals with construction of public policies that ensure better public policies. It thus aims at improving public policy-making process. It is the opposite of incrementalism. The obvious limitation of this approach is its demand for knowledge (facts and information) not within the reach of mere mortals. The prospects of the successful application of this model in developing countries like Nigeria is very dim indeed given the paucity of data needed. Systems Theory System approach considers public policy as an outcome of the political system. Public policy may also be seen as a political system’s response to demands arising from its environment. The political system comprises those identifiable and interrelated institutions and activities in a society that make authoritative allocations of values (decisions) that are binding on society