“…These generally have involved asking knowledgeable caregivers to report children's friendships (Buysse, 1993), documenting peer interactions using observational methods (Guralnick & Groom, 1988;Hartup, Laursen, Stewart & Eastensen, 1988), describing peer culture and play group entry through ethnography (Corsaro, 1981;1985;Peters, 1990;Preisler, 1993), obtaining peer ratings and friendship nominations using sociometric techniques (Asher, Singleton, Tinsley & Hymel, 1979;Dorval & Begin, 1985;Ladd & Mars, 1986;Musun-Miller, 1990;Quay &Jarrett, 1984), and multiple methods using combinations of these approaches (Gershman & Hayes, 1983;Guralnick & Groom, 1987;Hinde, Titmus, Easton & Tamplin, 1985;Howes, Droege & Matheson, 1994;McCandless & Marshall, 1957).…”