Gadamer draws heavily on the ideas of Romantic hermeneuticists such as Friedrich Schleiermacher and the work of later hermeneuticists such as Wilhelm Dilthey. He rejects as unachievable the goal of objectivity, and instead suggests that meaning is created through intersubjective communication.
Gadamer's philosophical project, as explained in Truth and Method, was to elaborate on the concept of "philosophical hermeneutics", which Heidegger in his Being and Time initiated but never dealt with at length. Gadamer's goal was to uncover the nature of human understanding. In the book Gadamer argued that "truth" and "method" were at odds with one another. He was critical of two approaches to the human sciences (Geisteswissenschaften). On the one hand, he was critical of modern approaches to humanities that modelled themselves on the natural sciences (and thus on rigorous scientific methods). On the other hand, he took issue with the traditional German approach to the humanities, represented for instance by Dilthey and Schleiermacher, which believed that correctly interpreting a text meant recovering the original intention of the author who wrote it.
In contrast to both of these positions, Gadamer argued that people have a 'historically effected consciousness' (wirkungsgeschichtliches Bewußtsein) and that they are embedded in the particular history and culture that shaped them. Thus interpreting a text involves a fusion of horizons (Horizontverschmelzung) where the scholar finds the ways that the text's history articulates with their own background. Truth and Method is not meant to be a programmatic statement about a new 'hermeneutic' method of interpreting texts. Gadamer intended Truth and Method to be a description of what we always do when we interpret things (even if we do not know it): "My real concern was and is philosophic: not what we do or what we ought to do, but what happens to us over and above our wanting and doing".
(Source: wikipedia)