TECHNOLOGY FOCUS - BIOLOGY - Preferred Components: In the host cell (h1), the host is a bacteria or filamentous fungus (preferably selected from Aspergillus, Trichoderma, Humicola, Chrysosporium, Myceliophthora or Thielavia species); Bacillus species (preferably selected Bacillus amyloliquefaciens, Bacillus licheniformis, Bacillus megaterium, Bacillus stearothermophilus or Bacillus subtilis. The host cell (h2) is a bacterial cell (preferably Bacillus species, especially Bacillus megaterium). Preferred Method: The first saccharification conditions comprise a temperature of 60-80 degrees C. The acid pH, and the time sufficient to reduce the yield stress is 5 minutes to 24 hours. The beta-glucosidase and/or the cellobiohydrolase enzymes are inactive or are rapidly inactivated under the first saccharification conditions. The yield stress is decreased by at least 80 (preferably at least 95)% relative the initial yield stress of the slurry, where the yield stress of the slurry is reduced to less than 10 Pa. The second saccharification conditions comprise a temperature in a range that is lower than the temperature of the first saccharification conditions. The amount of soluble sugar produced is greater than the amount of soluble sugar produced in a reference saccharification process in which pretreated feedstock is maintained with the endoglucanase, beta-glucosidase and cellobiohydrolase under second saccharification conditions for a time equal to the combined time under first and second saccharification conditions.    TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Components: The endoglucanse is a bacterial endoglucanse or its variant or fungal endoglucanse or its variant. The endoglucanses is a Streptomyces avermitilis endoglucanse or its variant. The variant endoglucanase polypeptide (v1) is derived from, and has improved catalytic activity relative to, a catalytic domain homolog of (SEQ ID NO: 1), where the homolog is from Streptomyces species, Micromonospora species, Actinosynnema species, Salinispora species, or Mycobacterium species. The variant (v1) comprises a cellulose binding domain. The endoglucanase catalytic domain and the cellulose binding domain are from the same parent endoglucanase. The variant (v1) has increased catalytic activity at pH 4 and 70 degrees C in comparison to an enzyme having a sequence given in the (SEQ ID NO: 1) or defined amino acid sequence having 226 amino acids (SEQ ID NO: 2) as given in the specification. The variant (v1) comprises a substitution at a position corresponding to at least one of 53 residues in the (SEQ ID NO: 1) as given in the specification e.g. Asp1(Glu/Gly/Val), Ser10(Phe/His/Leu/Thr/Trp/Tyr), Thr12(Ile/Val), Gln14(Glu/Lys/Leu/Pro), Gly15Asn, Ala29(His/Lys/Leu/Pro/Arg/Thr), Thr33(Ala/Glu/His/Ile/Leu/Gln/Arg/Val), Asp36Tyr, Ser37Glu or Ile41Val. The variant endoglucanse polypeptide (v2) comprises defined amino acid sequence having 222 amino acids (SEQ ID NO: 8) as given in the specification; comprises a cellulose binding domain. The polynucleotide codes for an endoglucanase having a signal sequence that is heterologous to the catalytic domain sequence. The polynucleotide is integrated into the cell's genomic DNA. The polynucleotide encodes for an endoglucanase polypeptide with an amino-terminal signal sequence having the sequence (SEQ ID NO: 9). The secreted endoglucanse polypeptide is expressed as a precursor that comprises an amino-terminal signal sequence having the sequence (SEQ ID NO:9). The heterologous polypeptide is a optionally cellulase protein selected from endoglucanse, cellobiohydrolase and beta-glucosidase; fungal cellulase or its variant; bacterial cellulase or its variant; Streptomyces avermitilis endoglucanse or its variant. The cellulase is from a Streptomyces species. The heterologous polypeptide comprises defined amino acid sequence having 222 amino acids (SEQ ID NO: 6) as given in the specification, the (SEQ ID NO: 7) or (SEQ ID NO: 8). In the fusion protein, the endoglucanse comprises a cellulose binding domain. The fusion protein comprises a spacer peptide between the signal peptide and the heterologous polypeptide. The nucleic acid further comprises a promoter operably linked to the protein encoding sequence. In the method (M5), the cellulase is a Streptomyces avermitilis endoglucanse or its variant. Preferred Composition: The composition further comprises at least one additional cellulase enzyme. EXAMPLE - No suitable example given.