In the Constructivist Theory, learning is based on past experiences. The student chooses only the information that can be integrated with these experiences.
When I am asked to do a task, I learn many things in the process. When I am asked particular questions on the task I am told to do, I am able to give my answers accurately and to the details. The outcome of the task might be positive or negative, but the hardships and triumphs experienced in the process of doing are extremely peculiar, unique and genuine. If I am asked to do the same task again or any other with similar nature, I can positively say that I will be doing it better and more successfully than the first time.
Such is the concept behind the Constructivist Theory. Learning about a thing will be easier if one has a background or previous experience on the subject. Even if it is the same task all over again, the information gathered from the past experience will greatly help in making the next task a success and the work and the learning enhanced. Naturally, only relevant information can be used in the next venture and all the other information shelved for further use. Constructivism is giving a lot of time and space for the learner to hone his/her skills and initiatives and discover where he/she can contribute more to the advancement of knowledge.
