Westerhoff, J. (1979). Will our Children Have Faith? New York,NY:The Seabury Press.

Westerhoff proposes a hierarchy of stages through which individuals travel in order to develop mature faith in God. At each of these stages faith has a distinctive style. One style of faith is not better than another just as a young tree with one ring is no less a tree than an older one with four hundred rings. Experienced faith is not an incomplete faith. One seeks to act with other believers in community and hence to expand into new styles of faith, not so as to possess better or greater faith, but only to mature in faith.
For a tree to grow it needs a proper environment: light, air, food, space, etc. A poor environment arrests the growth of the tree. So it is with the nurturing of faith. Just like the growth of a tree, growth in faith is a slow process which continually adds to what it already has. Progression from one style of faith to another does not discard the former but holds on to it and builds on it.
Westerhoff identifies four stages which he calls experienced faith, affiliative faith, searching faith and owned faith. His purpose for expanding on these stages is to make all who are in a position to teach and influence children become more responsive to the child’s character.
Westerhoff concludes that, because people in the church are at different stages in the development of their own faith, a combination of different ‘educational’ approaches is needed. The Holy Spirit uses experiences to help believers move from one style of faith to another. This happens, under the authority of Scripture, through modeling and through engagement in situations that challenging to go beyond the present style of faith. Every church, therefore, needs a variety of educational environments and experiences that foster the expansion of faith. Westerhoff’s stages and styles of faith present a very useful tool for the consideration and development of a responsive methodology. His conclusions are largely in line with those of Fowler and Vrijmoed. Each has chosen to group and characterize the stages differently but all agree on the main aspects.
Westerhoff provides few suggestions that can guide in the development of responsive methods of teaching and modeling. His work seems to be rooted in much pastoral experience. He does not present any research neither does he provide literature references to confirm his conclusions.
 

Summary:

Experienced faith (usually during preschool and early childhood)
Experience is a foundation of faith: a person first learns Christ not as a theological affirmation but as an subjective experience. Experiences of trust, love, and acceptance are important to Christian faith. “Be doers of the word, not hearers only; prove to me that the faith you speak of is real though not accompanied by deeds, and by my deeds I will prove you my faith.” God reveals Himself in His Word and His Works; it is first of all in His deeds that we begin to know Him.
God’s self revelation is an interaction with us which He has initiated. To be concerned about another’s faith is to share our faith with them in word and deed, and to permit them to share their faith with us in similar ways. We can share and respond, but the character of another’s faith can’t be determined. What we can do is provide an environment of sharing and interaction. Faith is a gift of the Holy Spirit, and it is important that we pray for the working of the Spirit in our children’s hearts.

Affiliative faith (usually childhood and early adolescence)
The person seeks to act with others in an accepting community with a clear sense of identity.
Affiliative faith has three characteristics:
1 A need to belong: We need to feel that we belong to a community and that through our active participation, we can make a contribution to its life. Persons with affiliative faith need to participate in the community’s activities, such as serving at a fellowship meal, singing in a choir, having a part in a Christmas celebration, participating in a service project, belonging to a group in the church where they know everyone’s name and where they will be missed when absent. Of crucial importance is the fact that we are wanted, needed, accepted and important to a community.
2 The importance of the heart, the feeling aspect: In terms of faith, actions in the realm of the affections are prior to acts of thinking. This is why participation in the arts - drama, music, painting, story telling - are important to the faith. Ceremonies and rituals are important because they are opportunities to act in ways that enhance the religious affections. Opportunities for experiencing awe, wonder, and mystery are needed by all of us.
3 A sense of authority and identity: The church must constantly be aware of its story and its tradition. We need to hear and tell that story, and we need to act so as to internalize our story. While faith is first experienced enactively, it is next experienced in images or stories. Learning the community’s story is, therefore, an essential of the faith.

Searching faith (usually late adolescence)
Searching faith has three characteristics:
1 There is much doubt and/or critical judgment, the need to act over against the understanding of faith acquired earlier. In order to move from an understanding of faith that belongs to the community to an understanding of faith that is our own, we need to doubt and question that faith. At this point the ‘religion of the head’ becomes equally important to the ‘religion of the heart’. Acts of the intellect, critical judgment, and inquiry into the meanings and purposes of the story and the ways by which the community of faith lives, are essential
2 Experimentation is common. There is a need to explore alternatives to our earlier understandings and ways and a need to test our own traditions by learning about others
3 There exists a strong need to commit our lives to persons and causes: young people may seem sometimes fickle, giving themselves to one ideology after the other, sometimes in rapid succession and on occasion in contradiction. That’s how we learn commitment.

Owned faith (Usually early adulthood)
The movement from experienced faith and affiliative faith through searching faith to owned faith is what historically has been called ‘conversion’.
Conversion (gradual or dramatic) involves a major change in a person’s thinking, feeling, and will: his behaviour and needs are obviously different. There is a desire to put faith into personal and social action. Typically, persons with owned faith want to witness to that faith in both word and deed. They struggle to eliminate any dissonance between their faith as stated in their beliefs and their actions in the world. “Whoever claims to be dwelling in Christ, binds himself to live as Christ did.”
Owned faith, personal faith, is God’s intention for every person. To reach owned faith (our full potential) is a long pilgrimage in which we need to be provided with an environment and experiences that encourage us to act in ways that assist our growth in faith. Christ died for all, no matter what style of faith we possess. None are outside his redeeming grace.